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From Ruiyuan Jiang <RJi...@fnpc.com>
Subject [users@httpd] Default Time out value for https connection to backend https server
Date Thu, 10 May 2012 18:49:32 GMT
Hi, all

I have an Apache reverse proxy server (v2.2.22, Redhat EL v6.2, x86_64). The reverse proxy
server connects to backend MS Exchange server for webmail through https connection. On the
proxy server, I configured proxy balancer with HA mode for two backend Exchange server in
the Apache configuration. It ran for over years no problem. Recently we migrated one of the
backend Exchange server to VMware based virtual server which is also primary backend server
configured in Apache. Now we see a lot of backend server switching on the Apache server with
the message and people get logged out from the MS webmail session from their browser:

[Tue May 08 23:50:14 2012] [error] [client 166.137.138.75] (70007)The timeout specified has
expired: proxy: error reading status line from remote server int_ex.corp.com:443
[Tue May 08 23:50:14 2012] [error] [client 166.137.138.75] proxy: Error reading from remote
server returned by /Microsoft-Server-ActiveSync
[Tue May 08 23:50:25 2012] [error] [client 113.28.152.94] (70007)The timeout specified has
expired: proxy: error reading status line from remote server int_ex.corp.com:443
[Tue May 08 23:50:25 2012] [error] [client 113.28.152.94] proxy: Error reading from remote
server returned by /Microsoft-Server-ActiveSync
[Tue May 08 23:50:27 2012] [error] [client 24.152.245.33] (70007)The timeout specified has
expired: proxy: error reading status line from remote server int_ex.corp.com:443
[Tue May 08 23:50:27 2012] [error] [client 24.152.245.33] proxy: Error reading from remote
server returned by /Microsoft-Server-ActiveSync
[Tue May 08 23:50:32 2012] [error] [client 198.228.199.206] (70007)The timeout specified has
expired: proxy: error reading status line from remote server int_ex.corp.com:443
[Tue May 08 23:50:32 2012] [error] [client 198.228.199.206] proxy: Error reading from remote
server returned by /Microsoft-Server-ActiveSync
[Tue May 08 23:50:33 2012] [error] [client 208.54.37.175] (70007)The timeout specified has
expired: proxy: error reading status line from remote server int_ex.corp.com:443
[Tue May 08 23:50:33 2012] [error] [client 208.54.37.175] proxy: Error reading from remote
server returned by /Microsoft-Server-ActiveSync

In the proxypass statement of the Apache httpd-ssl.conf to the backend server, I use default
value. What is the default timeout value that Apache reverse proxy server connects to backend
server for https for "proxypass" statement? How can I extend the timeout value? What could
be the reason or wrong here so I can modify the configuration? We have hundreds mobile devices
get emails from the Apache reverse proxy server. Thanks.

Ryan Jiang



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