Debian Server not accepting POST data

Hello, I have a Debian VPS that is not accepting post data. I can't log into any of my web sites or install new scripts on the server. I need someone to find and fix the problem for me. Please make sure you don't mess up any of my other settings. I have FFMPEG, MP4Box, FLVTool2, and LAME installed on the server as well as a custom php.ini. The server is running a video sharing script called Clip bucket. I don't know much about linux, but my host said it could be something simple.