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From "Noy, James (Accenture)" <James....@mhra.gsi.gov.uk>
Subject [users@httpd] apache reverse proxy connection errors
Date Wed, 23 Nov 2005 19:12:19 GMT
Hi All

 

I am encountering a problem with my Apache webproxy.  We are using
Apache 2.0.52 + OpenSSL with mod_proxy as a reverse proxy.  Use
ProxyPassReverse and ProxyPass.  When we load the server with 5+
simultaneous users one specific page breaks about 30% of the time.

 

It causes the following Apache error log messages:

 

[Wed Nov 23 06:05:48 2005] [error] [client <ip>] proxy: error reading
status line from remote server 10.100.0.71, referer:
https://www.myurl.org/uatwijsp/scripts/documentXML.jsp?ctxLayout_last=br
owseCXML.jsp&cmdLayout=&cmdLayout_P1=&cmdLayout_P2=&cmdBlock=all&cmd=ask
View&cmdP1=Status+%28Initial%29*66*0*wid*&cmdP2=

[Wed Nov 23 06:05:48 2005] [error] [client <ip>] proxy: Error reading
from remote server returned by
/uatwijsp/viewers/cdz/viewCDZDocument.jsp, referer:
https://www.myurl.org/uatwijsp/scripts/documentXML.jsp?ctxLayout_last=br
owseCXML.jsp&cmdLayout=&cmdLayout_P1=&cmdLayout_P2=&cmdBlock=all&cmd=ask
View&cmdP1=Status+%28Initial%29*66*0*wid*&cmdP2=

 

 

We used Ethereal (protocol analyser) to track the problem, and it
appears that the backend server (10.100.0.71) does respond to the
request for the page (viewCDZDocument.jsp).  The backend sends the first
few packets of that page but then doesn't get an acknowledgement so
retries a number of times and then gives up.

 

Reverse Proxy (Apache)
Backend (App Server)

GET viewCDZDocument.jsp
------------------------------------------------>

<-----------------------------------------------------------------------
---------ACK

<-----------------------------------------------------------------------
---------HTTP OK

<-----------------------------------------------------------------------
---------part of viewCDZDocument.jsp

<-----------------------------------------------------------------------
---------part of viewCDZDocument.jsp

<-----------------------------------------------------------------------
---------part of viewCDZDocument.jsp

(At this point the Backend receives no ACK from the Proxy so retries...)

 

Any ideas or thoughts as to how to tackle this would be gratefully
received, as this problem has us stumped; we have done a fair amount of
googling, etc. and not come up with much of use.

 

Thanks in advance and regards

 

James

 

 


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