First: Yesterday i've pulled the latest git repo. So maybe it's a new bug.
Problem: Since today, all login attempts with an existing user account get an "502 Proxy Error" in an alert-box with this content:
Failed login attempt, please try again.
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN"> <html><head> <title>502 Proxy Error</title> </head><body> <h1>Proxy Error</h1> <p>The proxy server received an invalid
response from an upstream server.<br />
The proxy server could not handle the request <em><a href="/login">POST /login</a></em>.<p> Reason: <strong>Error reading from remote server</strong></p></p> <hr> <address>Apache/2.2.15 (CentOS) Server at blahblahblah.com Port 80</address> </body></html>
Amazing: When you register a new account; or when you've logged in yesterday and didn't logout, then you can use the whole forum and every seems to be fine.
nodeBB latest (pulled from git repo)
redis 2.6.10 (Shared host)
Apache 2.2.15 (Shared host)
RewriteRule ^(.*) http://localhost:4567/$1 [P]