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From <>
Subject RE: RE: [users@httpd] httpd security
Date Sun, 23 Nov 2003 23:57:28 GMT

I can telnet to the server specifying port 23,
but port 80 will not work.

I don't know how to test the firewall to see what ports are blocked.
I can go to, but I don't know any other campus computers that have web servers
up for testing. If I could find out what incoming ports aren't blocked, I could change to
that port for the webserver with Apache. But I don't know how to do that.


> From: "Carsten P. Gehrke" <>
> Date: 2003/11/23 Sun PM 06:20:06 EST
> To: <>,  <>
> Subject: RE: RE: [users@httpd] httpd security
> At 14:07 23-11-03, wrote:
> >Ok,
> >Well I am not getting a 404 error. The browser just has a pop-up window 
> >saying the server is not responding. This is with :8080 at the end of the 
> >host name.
> >
> >I try to telnet to it with port 8080, and it gives the error:
> >
> >.Could not open a connection to host on port 8080
> >Connect failed
> >
> >If I telnet to the host with no port specification, I get no error and it 
> >connects fine, but I still have no luck in my browser.
> >
> >Matthew
> If you use telnet without a specific port, it will use port 23 
> (telnet).  You could connect to a Web server on the standard port by using 
> port 80, or to your MTA by using port 25 (SMTP).
> I don't remember the first part of this thread, but if you are behind a 
> firewall at work (which seems to be the case), and the sysadmin follows 
> SOPs, then all ports are blocked unless he specifically allows them.  In 
> that case it makes no difference if you set Apache for port 80 or port 
> 8080.  Of course, having telnet and FTP ports open while blocking http 
> would be unusual...
> The bottom line is that you need to find out if the firewall is blocking 
> traffic on port 80 incoming.  Can you connect to another Web server on a 
> different campus computer (and not the official site, which might be behind 
> a different firewall or in the DMZ)?
> Carsten
> -- 
> Carsten Gehrke     LFS No.: 190    using Linux since kernel 0.98

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