Guys Can you please solve this issue with permalink structure. I set Permalink Structure as %postname% So the URL Displays Till yester day there is no problem with my url. But today I visit the url It shows 404 Error Then I set Permalink Structure as Default Eg: http:/mysiteDotcom/?p=143 (Default Structure) It shows normal with Default Structure(No Problem with the Post). Again I sent permalink structure as %postname% it shows error. What I did Changed .htaccess file Restored Database (Deleted all Records and Restored) Deleted all Files and Restored Changed Theme. But Till have same problem. Can some one help with this issue.