We are running Apache 2.4.18 with mod_proxy and recently moved a backend site from a Weblogic server to an IIS server, and now we are facing intermittent issues when users connect. Users tend to receive the error:
Proxy Error
The proxy server received an invalid response from an upstream server.
The server could not handle the request GET/.
Reason: Error reading from remote server.
The logs usually look something like this:
[Wed Mar 29 14:10:42.893220 2017] [proxy:error] [pid 26435:tid 139648193414912] [client 12.34.56.78:62044] AH00898: Error reading from remote server returned by /
or this:
[Wed Mar 29 14:14:17.085777 2017] [proxy_http:error] [pid 26519:tid 139648184960768] (104)Connection reset by peer: [client 11.22.33.44:60271] AH01102: error reading status line from remote server iisserver.internaldomain.com:70 , referer: http://externaldomain.com/?reqp=1&r
eqr=
Below is the current config (IP addresses have been changed to protect the innocent.) We have tried several different options but had no luck. Anybody else ever experience this ? We would appreciate any and all help on the matter. We do not see any errors on the backend IIS server when this occurs. I have yet to do a network trace between the systems.
-Joe
<VirtualHost a.b.c.d:80>
ServerName www.externaldomain.com
ServerAlias externaldomain.com
SSLEngine off
TransferLog "logs/www_externaldomain_access_log"
ErrorLog "logs/www_externaldomain_error_log"
<Location />
ProxyPass http://iisserver.internaldomain.com:70/
ProxyPassReverse http://iisserver.internaldomain.com:70/
SetEnv force-proxy-request-1.0 1
SetEnv proxy-nokeepalive 1
</Location>
</VirtualHost>
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