Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.
Please contact the server administrator, support@credo-capital.com 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 500 Internal Server Error error was encountered while trying to use an ErrorDocument to handle the request

That's a fine error you have there... The script blew up and the reason why is in the httpd_error.log for that VirtualHost.

Did you have a specific problem that you planned to ask about, or did you want this thread to go largely ignored?

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 500 Internal Server Error error was encountered while trying to use an ErrorDocument to handle the request

What error in web-server Apache was happend if web-browser gives out such result?

we can only tell you what you've already cut and pasted... you need to configure your server correctly, or find what the problem is. look at the apache access and error logs for details.

in /usr/local/apache/logs/error_log I have found next:
notice: SIGHUP reseived. Attempting to restart
error: Cannot remove module mod_userdir.c. Not found in module list
notice: Apache configuring - resuming normal operations
notice: Accept mutex: sysvsem (Default: sysvsem)
warning: pid file /usr/local/apache/logs/httpd.pid overwritten. Unclean shutdown of previous Apache run?
notice: caught SIGTERM, shutting down
What from higher listed could cause inaccessibility of a site in a world wide web?
And what to do now?

hi there,

maybe stop doubling posts ???
AFAIK, you started two threads here : Linux - Newbie...
Bad
Cheers
slackie1000

How to kill the previous one?

You can't. If such situation happens, report the thread and someone will close one (or merge). But please try not to double post.

Whether you to me can help to adjust work of a web-server

The web-server worked well till the certain moment, but then suddenly started to give out a mistake 500 Internal Server Error. I looked files error.log, access.log, httpd.cong, but define the reason of malfunction I can not

Can I start a new thread if I do not receive any aswers in this one?