Server can ping but not browse to websites

[NickyW]

Hi,

Can anyone help,

I have a webserver(Windows 2000, IIS 5.0) that is unable to see any other
web sites through the browser. I can ping other websites I just can't browse
to them. This is a problem as one of my asp.net webpages creates
System.Net.WebRequest objects and gets data from a webpage on an external
site.

A reboot fixes the problem, but only for a few days, and then it happens
again.

It sounds like I am filling up some sort of object or connection cache which
gets cleared with a re-boot, but I can't find what or where this is.

Any suggestions?

Thanks,
Nicky

 

[MartinHTN]

Nicky:

I have no idea if this is even the problem, but have you cleared the DNS
resolver cache to see if that resolves the issue before rebooting? The
command is "ipconfig /flushdns." It's an easy thing to test for, so at least
try that.

Regards,
Martin

 

[Felix Zachlod]

Hi,

Can anyone help,

I have a webserver(Windows 2000, IIS 5.0) that is unable to see any other
web sites through the browser. I can ping other websites I just can't browse
to them. This is a problem as one of my asp.net webpages creates
System.Net.WebRequest objects and gets data from a webpage on an external
site.

A reboot fixes the problem, but only for a few days, and then it happens
again.

can you telnet to the other site and request the page via typing a
manual get command?

telnet www.foobar.com 80

GET / HTTP/1.1
Host:www.foobar.com
<CR><LF>

regards, Felix

 

[Felix Zachlod]

Nicky:

I have no idea if this is even the problem, but have you cleared the DNS
resolver cache to see if that resolves the issue before rebooting? The
command is "ipconfig /flushdns." It's an easy thing to test for, so at least
try that.

So if he can ping the remote host I don't think its a DNS Problem, as
the ping command does resolve from the DNS cache too (if TTL not expired)

regards, Felix