Proxy Error 502 When Using Www

Mar 27, 2008

I just moved my server from one colo center to another.

The server is running debian and Layered Panel.

The only thing that changed was my two IP's.

Once I got the server up I ran a Layered Panel script

designed for changing IP's ./reconfigure domain IP1 IP2 .

After that all seemed well until I found a problem.

All the free hosted sites on my system work fine unless one
uses www . For example site.myhost.com works but www.site.myhost.com causes a 502 Proxy error.

The same happens for top level domains, freehosted.com works but
www.freehostedsite.com causes 502 error.

A couple lines from my error log:
[Thu Mar 27 20:26:45 2008] [error] [client 86.156.43.42] proxy: DNS
lookup failure for: freehostedsite.com returned by /brit.htm
[Thu Mar 27 20:31:44 2008] [error] [client 69.137.107.47] proxy: DNS
lookup failure for: amour.myfreehost.com returned by
/petra/index.html

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HTTP 502 Proxy Error

May 7, 2008

Someone tried to access their webmail from a remote location and got a page not found error. It did have the following error like this at the bottom though:

"HTTP 502 Proxy Error - The specified Secure Sockets Layer (SSL) port is not allowed. ISA Server is not configured to allow SSL requests from this port. Most Web browsers use port 443 for SSL requests. (12204)

Internet Security and Acceleration Server"

This is a cpanel server with Centos. I did not find any info via cpanel's forums about the 502 error.

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One problem we see is that when the back-end PHP app suffers an error (e.g. a 404 or 500) , then mod_proxy ignores the nicely-formatted custom error page served up by our PHP app, and instead serves a very plain generic mod_proxy 404 or 500 error page back to the client. Is there a way to configure mod_proxy to serve up the 500/404 error page content which is created by the back-end app ?

(We thought ProxyErrorOverride might work, but it seems to be intended for the opposite scenario, where I want to *ignore* the 404 page content from the back-end and show a mod_proxy-defined error page instead.We're using apache 2.2 on 64-bit CentOS 6.5 ( httpd-2.2.15-31.el6.centos.x86_64 )

Config like:
...
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The Apache Server received an invalid response from an upstream server.

The Proxy server could not handle the request POST/irj/portal

Reason: Error reading from remote server
--------------------------------------------------
Apache/2.4.9 (Win32)OpenSSL/1.0.1h Server at www.xyz.com port 80

What do I need to check?

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I need to get working an apache2 in suse 11 as reverse proxy with a vendor's web page and it is not working. This is what happens:

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2. Then i write user and password

3. I press the login button and i should see:

http://192.168.1.10/cgi-bin/design/html_template/login.cgi
http://192.168.1.10/cgi-bin/design/html_template/webviewer.cgi

but instead of that i see:

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Code:
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Being relatively new to the Linux world, I don't exactly know why my reverse proxy settings are not working. Nothing i have tried has worked.

The code below is from my old windows server what does not seem to be working in my new 1&1 vps server. I have the below code at the moment at the bottom of my httpd_ip_defult.conf file under /var/www/vhosts/system/mydomain.com/conf/

Code:

ProxyPass /cam http://xxx.xxx.xxx.xxx:8008/cam_1.png
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The following errors also show up in my vhosts error log:

Code:

[Sun Oct 12 23:30:56 2014] [error] (70007)The timeout specified has expired: proxy: HTTP: attempt to connect to xxx.xxx.xxx.xxx:8008 (xxx.xxx.xxx.xxx) failed
[Sun Oct 12 23:30:56 2014] [error] ap_proxy_connect_backend disabling worker for (xxx.xxx.xxx.xxx)
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Basically, I need to fix this urgently as a core feature of my site relies on this setup.

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When accessing a backup in backup-manager in a user subscription via a reverse proxy (eg. plesk panel is called as localhost:8443) I get following error:

Internal error: Failed to exec pmm-ras: (array ( 'code' => 127, 'stdout' => 'Transport error: File 'clients' not found ', 'stderr' => '', )).
Message Failed to exec pmm-ras: (array ( 'code' => 127, 'stdout' => 'Transport error: File 'clients' not found ', 'stderr' => '', )).
File Connector.php
Line 227
Type PleskPMMResponseException

This happens when I try to download the backup and also when clicking on the backup name. These are the apache settings for the reverseproxy domain:

SSLProxyEngine On
AllowEncodedSlashes On
<Location />
ProxyPass https://localhost:8443/
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I'm not sure if this is the right forum, or if anyone can suggest a message board where I might get support on this.

This is what I have. I have Apache and IIS both running on Windows 2k3.

Apache is running in reverse Proxy mode sending multiple domains/virtual hosts to IIS.

Code:

ProxyRequests Off
<VirtualHost *:80>
ProxyPreserveHost On
ProxyPass / http://localhost:8080
ProxyPassReverse / [url]
ServerName mydomain.com

</VirtualHost>
Now, if I type in [url]everything works great and IIS (listening on 127.0.0.1:8080) serves the page. However, I am doing custom error trapping, so when I type in [url](and /mydirectory doesn't exist on IIS) I need to fire ASP code (via custom error messages/handling) on the IIS server and then present a data driven page.

However, Apache is returning A 502 error:

Code:
Proxy Error
The proxy server received an invalid response from an upstream server.
The proxy server could not handle the request GET /mydirectory.

Reason: DNS lookup failure for: localhost:8080mydirectory
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Super VPS

--------------

10GB Space
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