I am getting 500 - Internal Server Error.
Cause & Resolution
The error is quite generic and can be caused by many things. Some of the possible causes of this error are described in the articles below.
114058 For 10.x-11.x: Parallels Plesk SiteBuilder: PHP-CGI remote code execution vulnerability (CVE-2012-1823)
9755 "500 Internal server error" when trying to access Control Panel and websites
1571 "Internal Server Error" occurs if I try to open the Tomcat application via the browser using a URL like http://SERVER_IP/WEB_APP/. If I use port 9080, it works (http://SERVER_IP:9080/WEB_APP/)
114382 For 10.x (containers only): Internal Error 500 after PP 10 template installation on a Debian 5 container
113418 For 9.x: Control Panel is down with error: "mod_fastcgi.c : pid not found: No child processes"
8683 For 9.x: PP Control Panel freezes on backup file downloading
113466 For 9.5: Control Panel shows error 500 if min-procs is 0
5977 For 9.5: Parallels Plesk Panel 9.0 does not work on CentOS 4.x: "undefined symbol: PQescapeByteaConn"
114917 Parallels Plesk Panel returns Internal Server Error 500 due to disabled ping
1094 [FIX] Internal Server Error when browsing an .asp page on a domain
114436 For 10.4, 11.x: Cannot open migrated site in SiteEditor - 500 Internal server error
112530 For 10.x: Error in Plesk Panel CP: "Unable to place a FastCGI process in a JobObject"
112606 For 10.x: PHP only works as an ISAPI extension, not as FastCGI because of outdated iisfcgi.dll
9585 For 10.0.x: Internal Server Error 500 in Parallels Plesk Language Pack
113370 For 9.5, 10.x: The Panel is down and showing "500 - Internal Server Error"
9499 For 10.0.x: Parallels Plesk Panel does not allow viewing of uploaded applications
121733 For 11.5: php-cgi.exe process exited unexpectedly. Unable to load dynamic library "php_interbase.dll" - The specified module could not be found
122024 For 11.5:
> scriptProcessor could not be found in
> application configuration