DNS server timeout
We have a problem with dns resolution of a mx record that causes mail to backup and eventually lead to a NDR.
From my investigation it is a result of our DNS server not responding with the requested information for a mx query.
today: from mail server to DNS1 server
nslookup
set type=mx
domain.com
request timed out.
A DNS request to our secondary dns server (DNS2) give us the requested information.
When i restart DNS on DNS1, the query gives us the same correct information and mail starts to flow. I am not sure what is causing this. Any thoughts?
We do not use forwarders, just root hints. Both DNS1 and DNS2 servers are configured identically as far as i can tell.
DNS1 is the primary server for all DNS for our environment.
From my investigation it is a result of our DNS server not responding with the requested information for a mx query.
today: from mail server to DNS1 server
nslookup
set type=mx
domain.com
request timed out.
A DNS request to our secondary dns server (DNS2) give us the requested information.
When i restart DNS on DNS1, the query gives us the same correct information and mail starts to flow. I am not sure what is causing this. Any thoughts?
We do not use forwarders, just root hints. Both DNS1 and DNS2 servers are configured identically as far as i can tell.
DNS1 is the primary server for all DNS for our environment.
Ian Meredith
Do you have MX entries in your DNS?
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"When i restart DNS on DNS1, the query gives us the same correct information and mail starts to flow."
If the DNS service is stopping for some reason, there must be a related entry in the system event log. Probably under DNS or System. That's where you should start the search for the cause of the service stopping, esp. if it runs fine for a while and then just suddenly stops.
If the DNS service is stopping for some reason, there must be a related entry in the system event log. Probably under DNS or System. That's where you should start the search for the cause of the service stopping, esp. if it runs fine for a while and then just suddenly stops.
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the DNS service was not stopping, just forwarding requests wasnt working. I installed updates to the Server and rebooted it. DNS has had no issues today. I searched the event logs and found no error
Do you have any VPN connection active to maybe some other site, which has it's own DNS? In this case DNS queries might be forwarded to the other side of VPN for the other DNS to answer. Check it out with by typing:
nslookup
and see, which server is returned by default.
nslookup
and see, which server is returned by default.
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