Internal Server Error แก้ยังไงดี

เวลา เข้าเว็บเมลแล้วจะคลิกตรง forward mail กลับแล้ว error แก้ยังไงดี ตัวที่ใช้คือ SquirrelMail

Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator, webmaster@localhost and inform them of the time the error occurred, and anything you might have done that may have caused the error.

More information about this error may be available in the server error log.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.

ใน log

tail -f /var/log/httpd/error_log
[Tue Jun 30 17:58:06 2009] [error] SecServerSignature: the current signature is too short. Please set ServerTokens to Full
[Tue Jun 30 17:58:06 2009] [error] SecServerSignature: the current signature is too short. Please set ServerTokens to Full
[Tue Jun 30 17:58:22 2009] [error] SecServerSignature: the current signature is too short. Please set ServerTokens to Full
[Tue Jun 30 17:58:31 2009] [error] SecServerSignature: the current signature is too short. Please set ServerTokens to Full

ติดตัว mod_security นะครับ ลองปรับ rules ของ mod_security ดู หรือลองเอา Mod_sec ออกดูก่อนว่าได้หรือปล่าว