404 error on all pages, even Home

[MarcC]

I'm unable to log in to the PW control panel--it gives a 404, along with every other page except for /home/, and I'm seeing some strange entries in the site database. Screenshot:

https://www.dropbox.com/s/safuaqjk21iprt8/Screenshot%202014-10-16%2015.07.37.png?dl=0

The user "admin" has modified a ton of pages and I'm not sure if some of the status values are even real status values. Like /http404/ was assigned a status of 2059, so the site was showing a 500 error until I changed that back to published/hidden.

Any advice on what to check? I do have ProCache installed and activated. Thanks!

Edit: I just disabled ProCache through PHPMyAdmin and now things are working again. What might be going on? (Some mod want to move this to the ProCache forum?)

Edit 2: Problems again. Now even the home page is giving a 404. :-P This is so weird.

Edit 3: The problem seems to be intermittent 404 errors across the entire site. When one page starts working, they all work. Then for a while no pages will work (404). Repeat.

Edit 4: Not a ProcessWire issue--see reply below.

[MarcC]

Update: I traced the problem back to mod_security and it's fixed now.

Marc

[pwired]

Are you talking about mod_security in your CPanel ?

What were the settings/config before and after ?

[MarcC]

Hi pwired,

Correct, mod_security in CPanel. I'm still looking into the issue but so far it looks like there was a false positive in some encoded third-party cookie data. Can't share the settings/config atm. Mod_security made the decision to 404 these requests.