ProxyPass issues

ProxyPass issues

am 12.09.2007 22:07:39 von Nick Powers

Hello All,

We currently have in place a dual web server environment with a Redhat =
ES4/Apache 2.2.2 server using proxypass commands to send requests to our =
internal IIS server. We are experiencing periodic lost in connectivity to =
our IIS server from the Redhat proxy server. In the logs we see:

[Wed Sep 12 15:14:07 2007] [error] (110)Connection timed out: proxy: HTTP: =
attempt to connect to xxx.xxx.xxx.xxx:80 (www.backend.ca) failed
[Wed Sep 12 15:14:07 2007] [error] ap_proxy_connect_backend disabling =
worker for (www.backend.ca)
[Wed Sep 12 15:14:14 2007] [error] proxy: HTTP: disabled connection for =
(www.backend.ca)
[Wed Sep 12 15:14:16 2007] [error] proxy: HTTP: disabled connection for =
(www.backend.ca)
[Wed Sep 12 15:14:17 2007] [error] proxy: HTTP: disabled connection for =
(www.backend.ca)
[Wed Sep 12 15:14:19 2007] [error] proxy: HTTP: disabled connection for =
(www.backend.ca)
[Wed Sep 12 15:14:22 2007] [error] proxy: HTTP: disabled connection for =
(www.backend.ca)

When viewing the web pages during this time, the content is there but the =
images are missing.

Any thoughts, anyone else experience this?

Thanks,
Nick



------------------------------------------------------------ ---------
The official User-To-User support forum of the Apache HTTP Server Project.
See for more info.
To unsubscribe, e-mail: users-unsubscribe@httpd.apache.org
" from the digest: users-digest-unsubscribe@httpd.apache.org
For additional commands, e-mail: users-help@httpd.apache.org

RE: ProxyPass issues

am 12.09.2007 23:56:19 von Jeff Beard

Looks to me like it's an issue with the backend server not Apache. Have you
validated that the IIS server is responding to requests within the timeout
period when the problem is manifesting itself? A simple test would be to use
wget from the Linux host to the IIS server when you see the problem.


Cheers,

Jeff


> -----Original Message-----
> From: Nick Powers [mailto:nickpowers@trentu.ca]
> Sent: Wednesday, September 12, 2007 2:08 PM
> To: users@httpd.apache.org
> Subject: [users@httpd] ProxyPass issues
>
> Hello All,
>
> We currently have in place a dual web server environment with a Redhat
> ES4/Apache 2.2.2 server using proxypass commands to send requests to our
> internal IIS server. We are experiencing periodic lost in connectivity to
> our IIS server from the Redhat proxy server. In the logs we see:
>
> [Wed Sep 12 15:14:07 2007] [error] (110)Connection timed out: proxy: HTTP:
> attempt to connect to xxx.xxx.xxx.xxx:80 (www.backend.ca) failed
> [Wed Sep 12 15:14:07 2007] [error] ap_proxy_connect_backend disabling
> worker for (www.backend.ca)
> [Wed Sep 12 15:14:14 2007] [error] proxy: HTTP: disabled connection for
> (www.backend.ca)
> [Wed Sep 12 15:14:16 2007] [error] proxy: HTTP: disabled connection for
> (www.backend.ca)
> [Wed Sep 12 15:14:17 2007] [error] proxy: HTTP: disabled connection for
> (www.backend.ca)
> [Wed Sep 12 15:14:19 2007] [error] proxy: HTTP: disabled connection for
> (www.backend.ca)
> [Wed Sep 12 15:14:22 2007] [error] proxy: HTTP: disabled connection for
> (www.backend.ca)
>
> When viewing the web pages during this time, the content is there but the
> images are missing.
>
> Any thoughts, anyone else experience this?
>
> Thanks,
> Nick
>
>
>
> ------------------------------------------------------------ ---------
> The official User-To-User support forum of the Apache HTTP Server Project.
> See for more info.
> To unsubscribe, e-mail: users-unsubscribe@httpd.apache.org
> " from the digest: users-digest-unsubscribe@httpd.apache.org
> For additional commands, e-mail: users-help@httpd.apache.org



------------------------------------------------------------ ---------
The official User-To-User support forum of the Apache HTTP Server Project.
See for more info.
To unsubscribe, e-mail: users-unsubscribe@httpd.apache.org
" from the digest: users-digest-unsubscribe@httpd.apache.org
For additional commands, e-mail: users-help@httpd.apache.org

RE: ProxyPass issues

am 14.09.2007 17:04:37 von Nick Powers

Hey Jeff,

When I simultaneously send ping packets I lose none and I should note =
that I only lose the images for my pages. All data and links come up but I =
get no images. If I hit refresh the page comes up fully. Here is my =
config:

ProxyPass /index.php http://backend.ca/default.aspx retry=3D1
ProxyPassReverse /index.php http://backend.ca/default.aspx

ProxyPassReverseCookieDomain backend.ca www.frontend.ca=20
ProxyPassReverseCookiePath / /

SetEnv force-proxy-request-1.0 1
SetEnv proxy-nokeepalive 1

SSLProxyEngine On

RewriteEngine on
RewriteRule ^/secure/(.*)$ https://www.frontend.ca/secure/$1 [R,L]

I sniffed the traffic using Wireshark/Ethereal and nothing looked out of =
the ordinary. It just looks like the images are taking longer to come up =
than the text.=20

Thanks,

Nick



>>> "Jeff Beard" 12/09/2007 5:56 pm >>>
Looks to me like it's an issue with the backend server not Apache. Have =
you
validated that the IIS server is responding to requests within the timeout
period when the problem is manifesting itself? A simple test would be to =
use
wget from the Linux host to the IIS server when you see the problem.=20


Cheers,

Jeff


> -----Original Message-----
> From: Nick Powers [mailto:nickpowers@trentu.ca]=20
> Sent: Wednesday, September 12, 2007 2:08 PM
> To: users@httpd.apache.org=20
> Subject: [users@httpd] ProxyPass issues
>=20
> Hello All,
>=20
> We currently have in place a dual web server environment with a Redhat
> ES4/Apache 2.2.2 server using proxypass commands to send requests to our
> internal IIS server. We are experiencing periodic lost in connectivity =
to
> our IIS server from the Redhat proxy server. In the logs we see:
>=20
> [Wed Sep 12 15:14:07 2007] [error] (110)Connection timed out: proxy: =
HTTP:
> attempt to connect to xxx.xxx.xxx.xxx:80 (www.backend.ca) failed
> [Wed Sep 12 15:14:07 2007] [error] ap_proxy_connect_backend disabling
> worker for (www.backend.ca)
> [Wed Sep 12 15:14:14 2007] [error] proxy: HTTP: disabled connection for
> (www.backend.ca)
> [Wed Sep 12 15:14:16 2007] [error] proxy: HTTP: disabled connection for
> (www.backend.ca)
> [Wed Sep 12 15:14:17 2007] [error] proxy: HTTP: disabled connection for
> (www.backend.ca)
> [Wed Sep 12 15:14:19 2007] [error] proxy: HTTP: disabled connection for
> (www.backend.ca)
> [Wed Sep 12 15:14:22 2007] [error] proxy: HTTP: disabled connection for
> (www.backend.ca)
>=20
> When viewing the web pages during this time, the content is there but =
the
> images are missing.
>=20
> Any thoughts, anyone else experience this?
>=20
> Thanks,
> Nick
>=20
>=20
>=20
> ------------------------------------------------------------ ---------
> The official User-To-User support forum of the Apache HTTP Server =
Project.
> See for more info.
> To unsubscribe, e-mail: users-unsubscribe@httpd.apache.org=20
> " from the digest: users-digest-unsubscribe@httpd.apache.org=20
> For additional commands, e-mail: users-help@httpd.apache.org=20



------------------------------------------------------------ ---------
The official User-To-User support forum of the Apache HTTP Server Project.
See for more info.
To unsubscribe, e-mail: users-unsubscribe@httpd.apache.org=20
" from the digest: users-digest-unsubscribe@httpd.apache.org=20
For additional commands, e-mail: users-help@httpd.apache.org=20



------------------------------------------------------------ ---------
The official User-To-User support forum of the Apache HTTP Server Project.
See for more info.
To unsubscribe, e-mail: users-unsubscribe@httpd.apache.org
" from the digest: users-digest-unsubscribe@httpd.apache.org
For additional commands, e-mail: users-help@httpd.apache.org