There is a domain which is using Wordpress blog script. You can view pages, or sub menus but when you clich the topics it is giving following error: CGI Error The specified CGI application misbehaved by not returning a complete set of HTTP headers. If I will refresh then it says SERVICE UNAVAILABLE and all php scripts are not working. I have to restart the server to start also it made the same problem in SMF forums. Does anyone knows how to solve this problem? I have plesk 7.6.1 and Windows 2003 Server. Thanks a lot from now on.