The problem I am having is with a small number of users they can't POST form data larger then around 800 bytes to our server, but this size doesn't appear to be consistent.
The browser just sits there for a while and eventually times out. Small POST data works fine though. The problem also occurs when using GET instead of POST.
This problem only seems to happen on our server that's running ssl. Everything works as expected on our non ssl server.
Our ssl server is running (from HTTP headers): Apache/2.2.9 (Debian) PHP/5.3.1-0.dotdeb.1 with Suhosin-Patch mod_ssl/2.2.9 OpenSSL/0.9.8g
They they have not reported any other problems with any other websites but they aren't heavy web users.
It seems to be computer specific, if they use a different computer in the office it works fine. It doesn't seem to be browser specific either as as we have tried both IE and Firefox with the same results.
I have tried disabling as many services and programs as possible, logging in as a different user, running the machine in Safemode without success.
I can't work out why it works fine for 99% of the users.
Any ideas?