Internal Server Error

Hello,

I have big problem from seven days

All my websites down and this massage appeared

Internal Server Error

The server encountered an internal error or misconfiguration and was
unable to complete your request.
Please contact the server administrator, 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.

I send to cpanel support and he said

Hello,

I went to the URL provided, and see an error related to nginx. Please
note that we are unable to provide support for mod_rpaf or nginx, as
they are 3rd party products. Once nginx is disabled, if you are still
experiencing issues with your sites, please let me know so I can look
into this further.

when i open the logs

grep “Oct 01” /etc/httpd/logs/error_log |grep -v “File does not exist”
|tail -50

This errors appeared

[Sat Oct 01 18:24:01 2011] [notice] cannot use a full URL in a 401
ErrorDocument directive — ignoring!
[Sat Oct 01 18:24:01 2011] [notice] cannot use a full URL in a 401
ErrorDocument directive — ignoring!
[Sat Oct 01 18:24:02 2011] [notice] cannot use a full URL in a 401
ErrorDocument directive — ignoring!
[Sat Oct 01 18:24:02 2011] [notice] cannot use a full URL in a 401
ErrorDocument directive — ignoring!
[Sat Oct 01 18:24:02 2011] [notice] cannot use a full URL in a 401
ErrorDocument directive — ignoring!
[Sat Oct 01 18:24:02 2011] [notice] cannot use a full URL in a 401
ErrorDocument directive — ignoring!
[Sat Oct 01 18:24:02 2011] [notice] cannot use a full URL in a 401
ErrorDocument directive — ignoring!
[Sat Oct 01 18:24:02 2011] [notice] cannot use a full URL in a 401
ErrorDocument directive — ignoring!
[Sat Oct 01 18:24:03 2011] [notice] cannot use a full URL in a 401
ErrorDocument directive — ignoring!
[Sat Oct 01 18:24:03 2011] [notice] cannot use a full URL in a 401
ErrorDocument directive — ignoring!
[Sat Oct 01 18:24:03 2011] [notice] cannot use a full URL in a 401
ErrorDocument directive — ignoring!
[Sat Oct 01 18:24:03 2011] [notice] cannot use a full URL in a 401
ErrorDocument directive — ignoring!
[Sat Oct 01 18:24:03 2011] [notice] cannot use a full URL in a 401
ErrorDocument directive — ignoring!
[Sat Oct 01 18:24:04 2011] [notice] cannot use a full URL in a 401
ErrorDocument directive — ignoring!

[Sat Oct 01 18:24:04 2011] [notice] cannot use a full URL in a 401
ErrorDocument directive — ignoring!

I Tried to restart nginx but this error appeared

[alert]: could not open error log file: open() "/var

/log/nginx/error.log" failed (30: Read-only file system)

the configuration file /etc/nginx/nginx.conf syntax is ok
2011/10/02 09:26:31 [emerg] 20667#0: open() “/var/run/nginx.pid” failed
(30: Read-only file system)

configuration file /etc/nginx/nginx.conf test failed

Can any one help me in my problem ?

iam waiting you

thanks alot