TCP/IP filtering and opening DNS

[Eric Vanderveer]

I am having some problems with TCP/IP filtering and DNS with my network
cards. I allow ports that I need to remote into my servers and they work
great but when I allow port 53 (tCP and UDP) I can't get to any webpages.
Typing in the IP address works like a charm so I know its something with
DNS. Anyone have an idea what else I need to do?
Thanks
Eric Vanderveer

 

[Kevin D. Goodknecht [MVP]]

In

I am having some problems with TCP/IP filtering and DNS with my
network cards. I allow ports that I need to remote into my servers
and they work great but when I allow port 53 (tCP and UDP) I can't
get to any webpages. Typing in the IP address works like a charm so I
know its something with DNS. Anyone have an idea what else I need to
do?

You also need to open ports above 1024 for outgoing connections.
Packet filtering on the NIC closes ports in and out, when applications make
outgoing connections they use ports 1024 and higher.