We seem to be getting sporadic 502 errors, mostly when users are logging in. We run a Mediawiki based website, are running nginx 0.9.5, php-fpm 5.3.5. <br><br>The error:<br><br>2011/04/04 10:41:34 [error] 30517#0: *2143711 upstream sent too big header while reading response header from upstream, client: 192.168.100.5, server: _, request: "POST /index.php?title=Special:Userlogin&action=submitlogin&type=login&returnto=Main-Page HTTP/1.1", upstream: "fastcgi://<a href="http://127.0.0.1:9000">127.0.0.1:9000</a>", host: "<a href="http://www.wikihow.com">www.wikihow.com</a>", referrer: "<a href="http://www.wikihow.com/Special:Userlogin?returnto=Main-Page">http://www.wikihow.com/Special:Userlogin?returnto=Main-Page</a>"<br>
<br>Our nginx.conf proxy buffer settings: <br><br> proxy_buffers 16 16k;<br> proxy_buffer_size 32k;<br><br>We've tried increasing these values from the defaults a few times, and it doesn't seem to fix the issue.<br>
<br>Do you have any suggestions on how to fix this? <br><br>Thanks,<br>Travis<br><br>