nginx seems to be borked. Error 502 bad gateway

I've been seeing it since last night. Every now and then I can load a thread, but most of the time not. My guess is that I can load it when it hasn't yet been cached. Once it's cached, nginx has an issue, and can't load the page. Dynamic pages (search results, for instance) seem OK, and creating a new post seems to work.

Maybe it's just me?

Thanks for the report - do you see anything else besides a generic 502 message? I'll comb through the logs to see what I can find.

I have nginx only functioning as a load balancer for the forums; no page caching. vBulletin has been running well enough without any additional caching and the content updates too frequently.

I was just getting the generic 502 (and the nginx version). It seems like the problem has been cleared up, though...