Setting up Snort on Pfsense

If you would like to protect your system from any public attacks e.g. (Exploits, Transitive trust, Data driven, Infrastructure, DOS, Magic… Etc.)
then you should consider deploying IDS or IPS system to detect and protect your network from any attacks.
In Pfsense the famous open source firewall, you have the capability to deploy Snort which is one of the most famous and old IDPS systems around.
In order to do so you will have to go to Packages from System/Packages and install it
Machine generated alternative text: FSense Sy*em Cet I-WI AWL S-ä» {308b10a016e19a1cd6a208cbc3961927e16fc6766a4020d3c4ef54ea17925f0f}zud Platform CPU Type Uptime Current date/time Interface ard Firewall Service EDT 2014 Status Interfa ces WAN LAN DMZ Gold 185.23.75.124 192.168.1.155 t 203b—-rx 10.10.0.155 Hep * pfsens .5-RELEASE (a md64) It on Mon Aug 25 easD 8.3-RELEASE-p16 aining update status pfSemse Intel(R) Xeom(R) CPU ESS30 2.40GHz 4 CPUs: I package(s) x 4 core(s) 01 Hour 26 Minutes 54 Seconds sun 28 EET 2014
After clicking on the packages button, you will get a list of packages and among them snort will be listed there
Machine generated alternative text: Security Click package nanæ to accBs its website. Stable 2.9.7.0 pkg v3.2.1 platform: 2.1 Snort is an open source network intnßon preænbon and detection system (IDS/IPS). the benefits of nod, and anomalybased i rwpecton. Package i No
Click on the + on the far right to start the installation process.
Machine generated alternative text: System: Package Manager: Install Package Cancel p kage p kage package: will in the stilled. Confirm
I’ll Click on Confirm to continue
Machine generated alternative text: System: Available Package Manager: Install Package kag e In snort installation completed. Loading package instructions. . Custom commands.. . Executing custom_php install command() . done . Executing custom_php resync . done . Menu items . done . Serwices... done . Writing configuration.. Installation completed. snort setup instructions: done . Please visit the Snort settings tab first and select your desired rules . Afterwards visit the update rules tab to download your configured rules .
After it’s been installed now you’ll be able to see it on the Services menu tab.
Machine generated alternative text: FSense System: Awilable Interface Firewall S8Vice way server way Load se-v« Pro». sew Rewse Pro». & MT-PPP LAN Status . done . t and sel download Package Manager: kag snort installation co Loading package instr Custom commands.. . Executing custom_php Executing custom_php Menu items.. done . Serwices.. done. Writing configuration Installation complete snort setup instruct Please visit the Snor Afterwards visit the
Click on Snort and let’s go configure it.
Machine generated alternative text: Services: Snort 2.9.7.0 pkg v3.2.1 Barnyard2 IP Lists SID Mgmt Description Mgmt Sync Sn In Interfa ce Note : Global Settings U p d ate Ale Block Snort Performa nce This is the Snort Menu where you can see an overview of all your interface settings.please visit the Global Settings tab before adding an interface. New settings will not take effect until interface restart. Click on the icon to add an interface. Click on the Icon to edit an interface and settings. Click on the icon to delete an i ntefface and setti nos. icons will show current snort and barnyard2 status. Click on the status icons to toggle snort and barnyard2 status.
Before you start configuring Snort, you must know that in order to successfully get it to work you must be registered in at least one of the snort
communities which publishes important rules that tells snort what to check.. Similar to the firewall’s rules.
The websites are as following and you can find their settings under the Global settings tab in snort window
I will sign up to Snort free account and configure all of the snort supported rules in order to get the most of it. After signing up
I’ll need to activate my account.
Machine generated alternative text: Sign UP Email Please enter your Email Password Password confirmation . Agree to Sign up Sign in Didn't receive confirmation instructions?
Machine generated alternative text: ScarcH_ Get started with the world's Cet Started a most powerful detection software Download Snort and the rules Rules a you need to stay ahead of the latest threats Keep up-to-date with the latest Documents changes and documentation Documents Downloads Products Community Tcßos Contact Sign In Snort 30 Alpha A vailab/e
I have receieved the confirmation now and I’ll confirm my account now, Once confirmed Snort will provide you with a code called VRT
Oinkmaster confirmation code.
Machine generated alternative text: noreply@snort.org via sendgrid.info to me 'J Welcome mail.com' You can confirm your account email through the link below: Confirm my account Please do not reply to this automated message.
When your account is activated, you will need to go to your profile by clicking on your activated e-mail top right and you will find it on the left side.
Copy the code and paste it to your snort on pfsense.
Machine generated alternative text: ScarcH_ ogmail com Oinkcodc Account dc3417286d133fge161 Oinkcode Rcgcncratc Subscription Documents Downloads Products Community Tcßos Contact - ,agmailcom
Just like this
Machine generated alternative text: S n In te Global Settin g s *ase Choose The You WÉh To Instill VRT IP Lists SID Mgm t Mg m t sync Snort VRT free Registered User or paid Subscriber rules Up Rule Up VIRT Rule-s Snort VRT Oinkmaster Configura tion dc3417286d133fga
So after I added the code this is how my Global Settings tab looks like  (I enabled all the other free rules as well)
Machine generated alternative text: Snort: Global Settings Global Settings Update *ase Choose The You WÉh To Supp SID Mgm Mg m t Sync Instill VRT Install Inst. I Install Op Snort VRT free Registered User or paid Subscriber rules Up fre Rule Up VIRT Rule-s Snort VRT Oink master Configura tion 2154dc3417286d1 Obtiin it The Snort Community Ruleset is a GPLv2 VRT certified ruleset that is distributed free of charge without any VRT Ljcemse restrictions. This ruleset is updated daily and is a subset of the subscriber ruleset. Note: If you are a Snort VRT Paid Subscriber, the community ruleset is already built into your download of the Snort VRT rules, and there is no benefit in adding this rule set. ETOpen is an open source set of Snort rules whose coverage is more limited than ETPro. ETPro for Snort offers daily updates and extensive coverage of current malware threats. Up an ETPÆ Note: The ETPro rules contain all of the ETOpen rules, so the ETOpen rules are not required and are automatically disabled when the ETPro rules are selected. The OpenAppID package contains the application signatures required by the ApplD preprocessor. Note: You must enable download of the OpenAppID detectors package in order to utilize the Application ID preprocessor and any user-provided application detection rules. Once enabled, go to the LIPNTES tab and click to download updates. OpenAppID Detection Package Installed Detection Package Version—22S VER: ity
Machine generated alternative text: Ruks UMfate update Interval update Start Time Bloc'.d Interval Bloc'.d After D. install Keep SnMt Settings After to the 7 DAYS Please select the interval for rule updates. Choosing NEVER disables auto-updates. Hint: in most cases, every 12 hours is a good choice. 0 00: 05 Rules wil upda ofoo:o 7 CAYS Hint: in Enter the rule update start time in 24-hour format (HH:MM). Default is 00:05. te at the mtervalch hooslng 22 lect the gwi starting at the time specifEd here. FM example, u the default start each day for the nt of time l. the r will updite and 22:OS t 00:0 hosts to be bloc'.d. umg pacl.ge den All hosts d de d by will b. d Settings will not re Output detailed Save d dunng pacl.ge d stopping. Default is C. inst. I Sta u td Log g mg log when SnMt is starting an Note: Changing any settings on this page will affect all Snort-configured interfaces.
Now I will go to Updates tab and start updating rules tab. After clicking update this is how it will look like:
Machine generated alternative text: Services: Snort: Update Rules There is a new set of Snort VRT rules posted. Downloading.
When finished this is how it’ll look like
Machine generated alternative text: The Rules update has finished.. The rules update task is complete.. .
Once Finished this is how the updates tab will look like
Machine generated alternative text: Snort: Updates Global Settings Rule Set Name Publisher snort VRT Rules Snort GPLv2 Community Rules Emerging Threats Open Rules Snort OpenAppID Detectors S u pp INSTALLED RULE SET MDS SIGNATURE M D5 Signature Hash 4ssa8281b7cfcaoss263S6dof16c4362 7936110c28eag37f2g3d7e1adg83ae24 aeeac27aOae7dSOOafdbg06dbdIeOc77 oesffosoa06607fc1748gcaab84g32d3 UPDATE Y(NJR RULE SET Last update: 2014 16:28 Result: success SID Mgm Mg m t Sync M D5 Signature Date Monday, 2g-Dec-14 EET Tuesday, 30-Dec-14 EET Tuesday, 30-Dec-14 EET Tuesday, 30-Dec-14 EET Update Force MANAGE RULE SET LOG View Clear The log file is limited to 1024K in size and automatically clears when the limit is exceeded. NOTE: Snort.org and EmergingThreats.net will go down from time to time. Please be patient.
If you are connecting to Pfsense from any location where you are planning to enable Snort Interface for then before you enable snort
you must consider going to Pass Lists and add your IP (Either private if you’re planning to enable the LAN Interface or Public IP if you’re
planning to include WAN Interface).
Machine generated alternative text: Snort: Pass Lists S n In Global S etfings List Name Notes: p d ate Assigned Alias Lists Supp SID Mgm t Mgm t sync I. Here you can create Pass List files for your Snort package rules. Hosts on a Pass List are never blocked by Snort. 2. Add all the IP addresses or networks (in CIDR notation) you want to protect against Snort block decisions. 3. The default Par. List includes the WAN IP and gateway, defined DNS servers, VPNs and localbeattached networks. 4. ae careful, it is very easy to get locked out of your system by altering the default settings. Remember you must restart Snort on the interface for changes to take effect
In order to create a Pass list, you will have to create an Alias and add the Ips you would like to include in the pass note that these IPS are
never going to be checked or filtered by Snort.
In order to create an Alias List, click on Firewall Tab and scroll to Alias
Machine generated alternative text: VSense Interface Snort: Pass List Edi Firewall Service S G bbal Tr*fic Virtu* IPS Add the "ane
Once in IP list page click on the + button far right to add the Ips that you would like to pass.
Machine generated alternative text: Firewall: Aliases URLs All Name Note : Values Aliases act as placeholders for real hosts, networks or ports. They can be used to minimize the number of changes that have to be made if a host, network or port changes. You can enter the name of an alias instead of the host, network or port in all fields that have a red background. The alias Will be resolved according to the list above. If an alias cannot be resolved (e.g. because you deleted it), the corresponding element (e.g. filter/NAT/shaper rule) will be considered invalid and skipped.
From type select the type of hosts that you’d like to include there, for me I’d like to include only a couple of Ips
Machine generated alternative text: Firewall: Abas E'Et Description Type Host(s) Aliases: Edit Public LPs The name of the alias may only consist of the characters "a-z, A-Z, 0-9 and You may enter a description here for your reference (not parsed). Host(s) Enter as many hosts as you would like. Hosts must be specified by their IP address or fully qualified domain name FQDN). FQDN hostnames are periodically re-resolved and updated. If multiple IPS are returned by a DNS query, all are Used. 212.253.: Save Ca ncel work IP
Click Save and Apply then Close then go back to Snort’s Pass Lists and click on + to add new Pass list.
Select all the Networks, WAN IP, GATEWAY, DNS and finally the Alias that you have created and save.
Machine generated alternative text: Snort: Pass List Edit - passlist 11465 S In G bbal Settings U p date Add the "ane and 'kscrg»tøn of the passlist 11465 Lists IP Lists SID Mgm t Mg m t sync The list name may only consist of the characters "a-z, A-Z, 0-9 and You may enter a description here for your reference (not parsed). Add auto-generated IP Addresses. ". Note: No Spaces or dashes. WAN LPs WAN Gate WAN DNS Virtual IP AddresÆS Add firewall Local Networks to the list (excluding WAN). Add WAN interface to the list. Add WAN Gateways to the list. Add WAN DNS servers to the list. Add Virtual IP Addresses to the list. Add VPN Addresses to the list. Add cestom IP Addresses from AEases. Assigned Public Save Cancel
Once saved, this is how the pass lists is going to look like
Machine generated alternative text: Snort: Pass Lists S In G bbal Settings Name passlist 11465 Notes: U p d ate Assigned Alia Public Lists IP Lists SID Mgm t Mg m t sync Description I. Here you can create Pass List files for your Snort package rules. Hosts on a Pass List are never blocked by Snort. 2. Add all the IP addresses or networks (in CIDR notation) you want to protect against Snort block decisions. 3. The default Pass List includes the WAN IP and gateway, defined DNS servers, VPNs and localbeattached networks. 4. ae careful, it is very easy to get locked out of your system by altering the default settings. Remember you must restart Snort on the interface for changes to take effect
Now we can go back to Snort Interfaces and enable the WAN Interface for snort. I’ll click on Snort Interfaces tab and click + to add the new interface
Machine generated alternative text: Services: Snort 2.9.7.0 pkg v3.2.1 Supp Barnyard2 IP Lists SID Mgmt Description sync Sn In Interfa ce Note : G lob WI Settings Update Block Snort Performa nce This is the Snort Menu where you can see an overview of all your interface settings.please visit the Global Settings tab before adding an interface. New settings will not take effect until interface restart. Click on the icon to add an interface. Click on the icon to edit an interface and settings. Click on the Icon to delete an i ntefface and setti nos. icons will show current snort and barnyard2 status. Click on the status icons to toggle snort and barnyard2 status.
Below I will select block offenders in order to protect myself from DDoS attacks and other attempts to crack internet exposed servers e.g. (FTP, Http..etc) .
Machine generated alternative text: Snort: Interface - Edit Settings Sn In Setting s Enable ble Prep Supp w Lis-ts SID Mgmt Mgmt sync 2 IP Rep In Akrt Send Alerts to Offenders Kill Sta tes Which IP to m Logs SnMt alert. WAN Choose which interface this Snort imstance applies to. Hint: In most cases, you'll want to use WAN here. WAN Enter a meaningful description here for yourreference. will Ænd Alerts to the logs. Checking this will hosts that genera Checking this will kill states fM the bloc'.d IP both Hint: choosin Select which extracted the paclæt wish to block ggested, nd it is the def.ult valu Performance
Machine generated alternative text: Performance to sin Ch fast patte matcher algorithm. is AC-BNFA. Search Method split ANY-ANY S. arch Optim. AC-BNFA LOWMEM and AC-3NFA are recommended for low end systems, AC-SPLIT: low memory, high performance, short-hand for search-method ac split-any-any, AC: high memory, best performance, -NQ: the -nq option specifies that matches should not be queued and evaluated as they are found, AC-STD: moderate memory, high performance, ACS: small memory, moderate performance, AC-aANDED: small memory,moderate performance, AC-SPARSEåANDS: small memory, high performance. Enable splitting of ANY-ANY is Not . This Ætting memory/perforr-nan tr. It re dues m mory footprint by not putting the ANY-ANY part group gle port g roup. But dong require two port gro fM the ANY-ANY thus potentially reduang roup, but instead splits theÆ ru les Off In mto port g evaluations per paclæt - fM the specifE and perforr-nane. Enable arch . is . Stre m rts Check Di"ble This Ætting fast patte memM-y when d with Æarch-methods AC AC-SPLIT by dynamically dete"-n the of. state d on the total umber of states. When uÆ d with AC-BNFA, fail-state b. attempted, potentially perforr-nane paclæts agamst the engme. Do not stream This potential perforr-nane impro the idea the stream re built paclæt wil the the stream inÆ rted paclæt does n ot need to be luated. "y "fe to check this checknrn checking within SnMt to Hint: Most of this is E Ire.dy done at the it is
Here from Pass List I will select the list which I’ve created in the Pass List tab
Machine generated alternative text: Choose the networks {308b10a016e19a1cd6a208cbc3961927e16fc6766a4020d3c4ef54ea17925f0f}ort shoukf and whit*t V L ist this for PE E List to cus Alert SuppreÆion and d VIPs. or to shou List here default Net Exte Choose the Home Net you want this interface to use. Note: Default Home Net adds onw networks, WAN LPs, Gate Hint: Create an Alias to hold list of friendly LPs that the L ist want this mterfa that are not the Extemal Net Note: Default Extemal Net is ne Hint: Create List and add an Alias to it, to and then sto m at default. I Net Ættings. ttin g Exte Net. Most ssign the list 2 24ss V List ways. VPNs an Choose the Pass List you want this interface to use. Note: This option will H.nt: The def.ult Choose a or Ntermg if desied def. u It only be d when block offenders is List netAorG. WAN LPs. 'Site L ist d VIPs. Create an Filtering Choose the suppression or filtering file you want this interface to use. Note: Default option nppre"ion an Argemænts here w" automatka"y mserted "'to the {308b10a016e19a1cd6a208cbc3961927e16fc6766a4020d3c4ef54ea17925f0f}ort Ad ined p. "-through d filtering.
As you can see below when the icon is red it means that the Snort is not running and you will have to press on the red icon to turn it on.
Machine generated alternative text: FSense Syäem Interfaces Firewall Service Status Supp Barnyard2 DISABLED Diagnostics Gold Hep Mg m t * pfsen Sync Services: Snort 2.9.7.0 pkg v3.2.1 Sn In Interfa ce CJ WAN G bbal Settings pdate Block EFLA3LED IP Lists SID Mg mt Description WAN Snort Performa nce Ac-a"l A (D WARNING: Marked i Snot is not running on WAN. Click to stat. Note : This is the Snort Menu where you can see an overview of all your interface settings. New settings Will not take effect until interface restart. Click on the icon to add an interface. Click on the icon to edit an interface and settings. Click on the Icon to delete an i ntefface and setti nos. icons will show current snort and barnyard2 status. Click on the status icons to toggle snort and barnyard2 status.
After enabling the WAN interface you will have to go define some rules and enable them.
Machine generated alternative text: Services: Snort 2.9.7.0 pkg v3.2.1 Supp Barnyard2 DISABLED IP Lists SID Mgmt Description WAN Mg m t Sync Sn In Interfa ce CJ WAN Global Settings pdate Snort Performa nce (D Ac-a"l A Block EFLA3LED (D WARNING: Ma rked interface currently has no rules defined for Snort Note : This is the Snort Menu where you can see an overview of all your interface settings. New settings Will not take effect until interface restart. Click on the icon to add an interface. Click on the icon to edit an interface and settings. Click on the Icon to delete an i ntefface and setti nos. icons will show current snort and barnyard2 status. Click on the status icons to toggle snort and barnyard2 status.
Let’s define some rules for this interface e.g. FTP in order to do so I will click on the E next to the WAN description far right on the top snapshot.
We should go to WAN Categories and select different category in order to apply rules.
Machine generated alternative text: Snort: Interface WAN - Categories G bbal SetEngs Sn In Supp W AN 2 SID Mgmt sync w AN IP Rep WAN WAN settings w AN categ tÉ resoh'tøn w AN Rule W AN Væiab w AN Prep Resolve Flowbits Auto Flowbit Rules If checked, Snort will auto-enable rules required for checked flowbits. The Default is Checked. Sn will Note: the "'E in ch fu Any that —t th— will be to the list of in the Click to view auto-enabled rules required to satisfy flowbit dependencies their GIC:SLC to the List the {308b10a016e19a1cd6a208cbc3961927e16fc6766a4020d3c4ef54ea17925f0f}ort VRT IPS Po&y sekctøn Use IPS Policy Policy Selection If checked, Snort will use rules from one of three pre-defined IPS policies. of the SnMt VRT rule to ths Selecting this disable Note: Y of Snut VRT In the list although Th r—ts still if the Globil Settings tab. Th— will be to the pre- defied SnMt LPS policy the SnMt VRT. Snort IPS policies are: Connectivity, Balanced or Security. b&ks mst thr—ts with no file is stNW policy It is h and the It includE rule in is It plus rulEnch in sn Exal file. the fist
Note:
Enabling all rules might affect your VM or PM’s processor performance.
Now I will select all the rules from the rules list below and that will enable all the rules also that are included in the Snort GPLv2 Community.
Machine generated alternative text: the {308b10a016e19a1cd6a208cbc3961927e16fc6766a4020d3c4ef54ea17925f0f}ort w" bad at starte» All All Click to save changes and auto-resolve flowbit rules (if option is selected above) Enabled Ruleset: Snort Text Enabled snort snort snort snort snort sno sno sno snort snort : snort SO bad-trafficso.rules browser-ieso.rules browser-other so. rules browser-plugins so. rules chatso.rules dos so. rules exploit-kitso.rules exploitso.rules file-executableso.rules file-flashso.rules Ruleset: Snort GPLv2 Community Rules Snort GPLv2 Community Rules (VRT certified) Ruleset: ET Open emerging-activeX. rules emerging-attack respomse.rules emerging-botcc.poftgrouped.rules emerging-botcc.rules emerging-chat. rules emergi ng-ciarmy.rules emerging-compromised. rules emerging-current events.rules emerging-deleted. rules emerging-dms.rules bled snort snort snort sno sno snort snort snort snort snort app-detect.rules attack-responses. rules backdoor. rules bad-traffic. rules blacklist.rules botnet-cnc.rules browser-chrome.rules browser-fi refox. rules browser-ie.rules browser-other. rules
Once added, you will have to apply changes and then click on Apply …. And for any reason the service did not start as in the below
snapshot then you should navigate to Status tab and check the “System Logs”
Machine generated alternative text: Services: Snort 2.9.7.0 pkg v3.2.1 Barnyard2 DISABLED w Lists SID Mg Description WAN Sync Sn In Interfa ce WAN G Settings Snort U p d ate Ale Performa nce Block EFLA3LED
In System logs I noticed the following error:
Machine generated alternative text: Dec 30 Dec 30 Dec 30 Dec 30 Dec 30 Dec 30 php: php: php: php: /snolt/snolt /snolt/snolt /snolt/snolt /snolt/snolt rules.php: rules.php: rules.php: rules.php: (Snort) Updating rules configuration for: WAN (Snort) Enabling any flowbit-required rules for: WAN... (Snort) Building new sig-msg.map file for WAN... (snort) snort RELOAD CONFIG for WAN(deo)... .ruIes(427) Unknown rule option: snort(S8603): ATAL ERROR: /usr/pbi/snolt-amd#/etc/snolt/snolt 6026 deo/rules/snolt 'sd_pattern'. kernel: deO: promiscuous mode disabled
After doing a lot of digging on this error it seems that it’s caused by the rule “Sensitive Data” and after disabling all the rule set in this rule
I was able to start Snort on WAN again.
Machine generated alternative text: Snort: Interface WAN - Rules: sensitive- U p d ate data.rules Supp SID '"m t '"m t Sync WAN IP Rep WAN WAN settings WAN Select th w AN WAN Rules WAN Prep tegMy to WAN 2 Ava "a bk Ruk CategorÉ-s ID (SID) Apply Note: When finished, click APPLY to save and send any SID enable/disable changes made on this tab to Snort. Remove Enable/DisabIe changes in the current Category Remove all Enable/DisabIe changes in all Categories Disable all rules in the current Category Enable all rules in the current Category View full file contents for the current Category Catewry's $HOME_ $HOME $HOME $HOME_ $HOME_ Category Rules Summary NET NET NET NET NET Destina tion Message SENSITIVE-DATA credit card Numbers SENSITIVE-DATA U.s. social security Numbers (vith dashes) SENSITIVE-DATA U.s. social security Numbers (w/out dashes) SENSITIVE-DATA Email Addresses SENSITIVE-DATA U.s. Phone Numbers EXTERNAL $EXTERNAL $EXTERNAL $EXTERNAL_ SEXTERNAL_ NET NET NET NET NET Total Rules: S Enabled: O Disabled: S User Enabled: O Rule is Rule is User Disabled: S Auto-Managed: O
When this is done, I will test snort if it’s working by simply try to hack into pfsense’s portal by using wrong passwords for let’s say
10/20 times and see if my IP will get blocked (I’ll use a different Public IP which is not in the pass lists)..
After trying about 7 attempts with wrong username and password I tried refreshing the page
Machine generated alternative text: FSense Username or Password incorrect Enter username and password to login. Login
Here is what I got
Machine generated alternative text: http Apps pfsense C Cl pfsense. index.php For quick access, place your bookmarks here on the bookmarks bar. Imoort bookmarks now This webpage is not available
I will go check Snort blocked list and see if the IP that I tried connecting from is there note that the Public IP which I was
trying to connect from was
Machine generated alternative text: 185Z111
As you can see below the IP has been blocked and the alert description says it as it is (http_inspection)
So that means that our snort works as it’s supposedly expected to.
Machine generated alternative text: Snort: Blocked Hosts S n Glob wl S eth n g s Bbcked '-bsts Log Auto Refresh and Log View Last 500 '-bsts Bbcked by {308b10a016e19a1cd6a208cbc3961927e16fc6766a4020d3c4ef54ea17925f0f}ort U p d ate Re All hosts will b. . fresh ON. w SID Mgm t Mgm t Sync 500. g. hosts will b. rernm.d. mber of en 500 tries to - 12/30/14- w. is Enter nu 185—111 Alert Description (littp inspect) NO CONTENT-LENGTH OR TRANSFER-ENCODING IN HTTP RESPONS I host IP address is currently being blocked.
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