Re: Windows XP, "HTTP and FTP shut off"

[Scott Klement <pctech@xxxxxxxxxxxxxxxx>]

Another thought, since this is a PC:  A lot of times people will have 2 
or 3 different firewall programs installed on their PCs.  Every security 
(i.e. anti-virus) software seems to come with it's own firewall.

When I'm troubleshooting stuff like this, I often find that Windows 
built-in firewall is set up properly, but that a user had installed some 
internet security suite in the past (and perhaps stopped using it and 
forgot all about it) and it included another firewall that's blocking 
access.

Another common error is forgetting to set up the default gateway.  I've 
run into several situations where the user says "telnet works, but HTTP 
doesn't" and when I look at it, I learn that telnet only works to hosts 
in the same subnet, and HTTP also works to those same hosts, and neither 
works outside the subnet.  But, the user didn't realize this because 
they only use telnet for local machines, and only use HTTP for Internet, 
and therefore had the mistaken impression that telnet worked and HTTP 
didn't.  All they needed was to have the default gateway set up properly.

Once, I ran into a user who had created the same symptom by setting up 
the netmask wrong.  (For some reason, they decided to use 100.0.0.0 as 
their netmask -- you can imagine how that'd foul up routing...


Jones, John (US) wrote:
> If you can telnet and ping from that machine to others then your network
> connection is fine.  There is a block on HTTP connection.  My first
> thought, since you've disabled the firewall, is to double-check your DNS
> settings.  My second thought is to run anti-virus and anti-spyware
> scans.