How to find and fix issue with Pound and HAProxy

view story

http://serverfault.com – Pound sits in front of HAProxy (on the same box) to perform SSL off-load. Requests are passed to where HAProxy then balances the requests across backend servers for a hosted ASP .NET web app. A user is getting HTTP error 500 (Internal Server Error) returned to their browser this morning and I can see it is comming from Pound. They see no log entry in their web app (IIS) server logs, so its not hitting the back end servers. I think the problem is possibly with HAProxy. Lets review the logs: Initialy the users ( hits Pound on the load balancer: Nov 12 10:02:24 lb1 pound (HowTos)