In PRTG Server Administrator, I've set PRTG to SSL. All connections to the PRTG web interface go through port 443. Still, PRTG does not allow another application to use port 80 (I get an error message in the other application).
How can I clear port 80?
Created on Jun 8, 2010 9:06:15 AM by
Last change on Jul 21, 2010 1:52:00 PM by
This article applies to PRTG Network Monitor 7.3 or later.
You've set the PRTG web server to use SSL on port 443. However, on startup the PRTG server checks if port 80 is used on the host computer. If it is not, PRTG sets a redirect for port 80: All web connections to this port are redirected to port 443.
This is to avoid users seeing a "Connection failed" message in case they do not include https:// when calling the PRTG web interface.
If you want to use port 80 for other web applications this is—of course—an undesired behavior. There are two solutions for this.
If you start a program or service that uses port 80 prior to PRTG, port 80 will already be taken on PRTG startup and therefore not be blocked.
This can be achieved, for example, by changing settings in the Windows services. There, you could start the PRTG service depended on e.g. an Apache service so that the Apache web server starts first.
If solution #1 is not possible in your case, you can add a registry entry that disables port 80 redirection for PRTG.
Important: Please make proper backup before editing the registry!
In the registry editor, go to
32bit: HKLM\Software\Paessler\PRTG Network Monitor\Server\Webserver 64bit: HKLM\Software\Wow6432Node\Paessler\PRTG Network Monitor\Server\Webserver
Note: For PRTG 8 you might see the values in the additional sub-key V7 or V8.
There, create a new DWORD value with the name
NoSSLRedirect
Set this value to 1 to disable port 80 redirection. Set it to 0 to enable port 80 redirection again.
Created on Jun 8, 2010 9:07:52 AM by
Last change on Jan 16, 2012 4:13:52 PM by
Only for information: On 64 bit the reg path is
HKLM\SOFTWARE\Wow6432Node\Paessler\PRTG Network Monitor\Server\Webserver
Created on Jan 16, 2012 3:35:48 PM by
Last change on Jan 16, 2012 4:13:00 PM by
Hello, this solution doesn't work when you use an other port for HTTP. We do not you SSL for PRTG. We have change the HTTP Port from 80 to 83 with the registry hack but with no luck.
Created on Feb 2, 2012 8:29:31 AM by
This hack does not change the HTTP Port, this only disables the redirect from port 80. So the only values which are accepted for 'NoSSLRedirect' are 1 and 0.
Created on Feb 2, 2012 3:39:20 PM by
I know. The value "NoSSLRedirect" is set to 1. I have set the HTTP Port in the administration to 83 but PTRG use also port 80.
Created on Feb 3, 2012 12:07:38 PM by
Sorry, I made a mistake there, of course the registry hack only works when the PRTG Webserver is set to serve HTTPS on port 443. But if you set the Webserver to serve normal HTTP on another port than 80, port 80 will be free and not used by the "PRTG Server.exe".
Created on Feb 3, 2012 4:21:54 PM by
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