Re: DNS stops resolving...outbound email stuck until dns restarted

I will try the clearing of the cache next time it fails. Now it is just a
waiting game until it failes again.

We do have forwarders in there. Both sites do actually go to the same isp.

I will check with the Cisco guys here in regards to the ports.

Thanks for the assistance. There are 7 of us here and we are hitting a
wall. I was hoping someone else out there had run into this problem. I
can't believe that we are the only ones. We have been trying to come up
with what is similar between the two clients. We have about 100 clients and
it is just these two. We have quite a few that are with the same isp and
not having problems.

"Kevin D. Goodknecht Sr. [MVP]" <admin@xxxxxxxxxxxxxx> wrote in message
news:%23l$78ks0GHA.4264@xxxxxxxxxxxxxxxxxxxxxxx
Patty S wrote:
We automatically do that when we install.

Instead of restarting the DNS service, does clearing the DNS server cache
work?

Are you using a forwarder?
Has it (the forwarder) been tested to allow recursion?

Does your firewall allow your DNS access to any address on port 53 UDP and
TCP?
If your firewall only allows access to your ISP's DNS on those two ports,
check the box "Do not use recursion for this domain" on the forwarders
tab.

On the subject of forwarders, my preference is to not use a forwarder and
just let DNS do its own recursive lookups. It actually make you DNS less
susceptible to corruption because it will only use Authoritative servers
for
resolution. I use a forwarder only if I have a caching DNS that I'm in
control of.


--
Best regards,
Kevin D. Goodknecht Sr. [MVP]
Hope This Helps
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