Thread:Project:Support desk/Save Page and Show Preview Buttons Not Working As Expected

Some pages work some pages don't. I have no extensions and using version 1.25.1 of MediaWiki. Every page worked great 3-4 days ago. Today I went to add info on a page and Show Preview kicked me back to my website's 'front door.' Same happened when trying to use the Save Page button. So I went to the page (all previous info is there and fine), clicked 'edit' and didn't add anything at all and tried the Show Preview and Save Page buttons, both just kicked me back to my front door again. I have changed nothing in any files such as localsettings.php (at least not for awhile now) - no extensions have ever been included. I just installed it May 1st and in that first week, I made all the changes I needed and that was only to the localsettings.php file. Other than that I make a backup once per week. So since at least May 8th it has been working great - installed the newest version the day it came out-- still worked great until today. What can I do?