When I try to access any site, document library or any other web part, following error page appeared: "An unexpected error has occurred. Web Parts Maintenance Page: If you have permission, you can use this page to temporarily close Web Parts or remove personal settings. For more information, contact your site administrator. Troubleshoot issues with Windows SharePoint Services."This is happening on all sites on the server :(Any ideas?

What was the last thing that was done to the SharePoint server? Have you installed any web parts or add ons? You could try running the Configuration Wizard again, but I'm not sure that will solve it...

Noops.We did notinstalled anything on the server. One thing do happened.All web sites and Application pool in IISwas stopped and we started them. After that on each site we are facing the error page. :(

Hrmm... Did anything change with the account? Password/permissions? I'd give the configuration wizard a go.Administrative Tools --> SharePoint Products and Technologies Configuration Wizard, next, yes, do not disconnect, next, no will continue to host, and then Next to kick it off. Your sites will be offline while it runs though, but I suspect this won't be a huge issue as they are already broken...

Thanks for the reply.Run "SharePoint Products and Technologies Configuration Wizard", but noops :(I am not sure with accounts issue. Any advise?

Anything in the trace/event logs that may indicate the cause? I fear you may be looking at a re-install. You can probably save your content databases however. Backup and restore once you have the new farm up and running. :)

Hello, Please try the following method: 1. Open web.config file of current web application 2. Change the trust level from WSS_Minimial to WSS_Medium 3. Run iisreset Then, see whether it helps. Regards,JerryXing-Bing Yu

Thanks Flamer and Jerry for you reply and help. Both of your suggestions was helpfull for finding the solution.Regards,

Mr. Malik chk this URL http://blogs.msdn.com/b/brismith/archive/2007/03/23/an-unexpected-error-has-occurred-or-unknown-error-in-wss-3-0.aspx

Hi Xing-Bing Yu I your solution helped me too thanks Bigmowestside