500 Internal Server Error - Every single page

Not sure what the heck happened here, but my vB instance seems to be completely fubared. I was installing DB's gallery, fiddling with some innocuous settings, and now every single php flle (even phpinfo.php) throws me a 500 error with "premature end of script headers".

I've no idea what to do at this point, I don't think it's really vBulletin - just something triggered and I've no clue what. Any pointers in the right direction would be fantastic.

[ForceHSS]

Have you tried to revert all work you done before this messed up

I have, no change. Even a phpinfo.php on a completely different domain (on the same host) throws the same error, so I don't think it's related to vB.

[ForceHSS]

did your host change something

Nope. It's not a managed server. Nothing changed, no auto-update, nothing. :\

[ForceHSS]

This see what others say very late here cant think
Do check server error logs might give more information

I see tons of this in suphp_log:

oot@s1 [/usr/local/apache/logs]# tail suphp_log
[Sun Mar 22 21:49:17 2015] [info] Executing "(my server path)/public_html/forum/showthread.php" as UID 508, GID 504

[ForceHSS]

Have enabled mod_userdir I believe your problem is with Suphp

It's permissions related. No idea why they changed, or how, but here's where I'm at...

I have a phpinfo.php that's 755, owner/group is the apache user. It works. I have a WAP plugin for my site that works, with the whole folder structure 755 with the same owner/group.

I figured "hey, it worked there", so I 755'd my whole forum folder, and set the owner/group to the apache user again, but I still get 500s on all of my vB pages.

I'm making some progress but my eyeballs are starting to bug out... If anyone has any ideas I'll try just about anything at this point. I've chmodded my face off for the last several hours and am running out of ideas.

--------------- Added [DATE]1427081379[/DATE] at [TIME]1427081379[/TIME] ---------------

Just to keep it updated - I rebuild apache, disabled suexec and suphp, still no dice.

[ForceHSS]

If you google the error you have it comes up with some fixes