Not Acceptable! An appropriate representation of the requested resource could not be found on this server. This error was generated by Mod_Security

Question

I'm new to moodle environment and I'm having this error:

Not Acceptable!

An appropriate representation of the requested resource could not be found on this server. This error was generated by Mod_Security.

I haven't done anything, I'm just viewing the registered users in my website:
http://www.joyfementira.com/dnsc/it14lms
I've noticed that my profile picture is not properly loaded so I clicked on it (picture's position), and after that the error came out.

What probably caused this error and how would I fix it?

Answer 1

I was experiencing same issue with my WP site shared-hosted in HostMonster. I resolved simply by accessing to the server via SSH and added the following lines on the .htaccess file :

<IfModule mod_security.c>
  SecFilterEngine Off
  SecFilterScanPOST Off
</IfModule>

Answer 2

Just to add to the answers. If this happens while you are trying to login to a WordPress website admin and you are using any type of VPN on your machine, you'd have to turn it off to solve the problem.

If you turn off your VPN, you'd be able to login without experiencing the issue.

Answer 3

Apache has a mod_security tool that tries to block SQL injections by url. This rule is also blocking some real urls. The solution is:

• access WHM in your dedicated server
• search for mod_security tools
• check if it's blocking some urls
• click in the rule id
• click in deploy and Restart Apache

if you don't have access to WHM in your server. Pass this issue to your server administrator.

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This is the rule that was blocking my urls

SecRule REQUEST_HEADERS|XML:/*|!REQUEST_HEADERS:Referer "\b(\d+) ?= ?\1\b|\'\"[\'\"] ?= ?[\'\"]\2\b" \ "phase:2,capture,t:none,t:urlDecodeUni,t:htmlEntityDecode,t:replaceComments,t:compressWhiteSpace,t:lowercase,ctl:auditLogParts=+E,log,auditlog,msg:'SQL Injection Attack',id:'959901',tag:'WEB_ATTACK/SQL_INJECTION',logdata:'%{TX.0}',severity:'2'"