RE: Problems with HAProxy, down servers and 503 errors

From: John Marrett <>
Date: Sun, 25 Jan 2009 19:14:59 -0500

Forgot the link for the IIS 503 / RST solution:

I believe that our application itself (currently) throws 503s, so we couldn't use some kind of down server on 503 response type solution, though we could probably change that if it might afford us a solution.


> -----Original Message-----
> From: John Marrett []
> Sent: January 25, 2009 7:06 PM
> To: Willy Tarreau
> Cc:
> Subject: RE: Problems with HAProxy, down servers and 503 errors
> Willy,
> > No problem, no time wasted yet !
> Well, none of your time :) It took me far longer than it
> should have to
> realise my error. Regretable, packet captures are usually my first
> diagnostic tool. A mistake I won't make again any time soon.
> > Have you at least found a solution to your issue ?
> I've found a partial solution to my issue, and in fact, now I have a
> question that's relevant to the list. The backend server is IIS, if
> you're getting 503s during shutdowns, you can use this
> solution to turn
> them into RSTs [1].
> The RST is sent by IIS after it receives the full client request from
> HAProxy (I suspect that it may want to see the Host header before it
> decides how it wants to treat the request). When HAProxy receives the
> RST it returns a 503 to the client (respecting the
> errorfile!). Despite
> the presence of "option redistribute", HAProxy does not send
> the request
> to another backend server.
> If there was a way to get HAProxy to send the request to another
> functional real server at this time it would be great, though I fear
> that HAProxy no longer has the request information after
> having sent it
> to the server.
> Any further advice would be much appreciated, I can provide packet
> captures off list if required.
> -JohnF
Received on 2009/01/26 01:14

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