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Unable to bind to destination server in DNS

mbavisi
mbavisi asked
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Last Modified: 2008-02-01
I have emails which are being queued on our Exchange 2003 server.  We receive thefollowing message

Unable to bind to destination server in DNS

From the command prompt I am unable to telnet on port 25 to this domain and receive the following message: domain.co.uk.  Is this correct check to make?

Is there anything I can do or advise the recipient to do in order to resolve this.
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Expert of the Year 2007
Expert of the Year 2006

Commented:
Rather than just telnet to domain.com, you need to find the MX records for that domain.

For example... microsoft.com:

C:\>nslookup
Default Server:  server.domain.co.uk
Address:  192.168.1.1

> set type=mx
> microsoft.com
Server:  server.domain.co.uk
Address:  192.168.1.1

Non-authoritative answer:

microsoft.com   MX preference = 10, mail exchanger = mailc.microsoft.com
microsoft.com   MX preference = 10, mail exchanger = maila.microsoft.com
microsoft.com   MX preference = 10, mail exchanger = mailb.microsoft.com

maila.microsoft.com     internet address = 131.107.1.7
maila.microsoft.com     internet address = 131.107.1.6
mailb.microsoft.com     internet address = 131.107.3.123
mailb.microsoft.com     internet address = 205.248.102.77
mailc.microsoft.com     internet address = 205.248.102.78
mailc.microsoft.com     internet address = 205.248.102.79
>

When you have the MX server information, see if you can telnet to port 25 of the remote server.

For example (using the above information)
telnet maila.microsoft.com 25


Simon.

Author

Commented:
Ok I can successfully telnet to their mail server but still receive the error.  Any suggesttions to resolve this?
Expert of the Year 2007
Expert of the Year 2006
Commented:
How is the DNS configured?
Do you have external DNS server configured anywhere in the Exchange configuration?
If you do, remove them. The only DNS Servers that should be set are on the network card, pointing to the domain controllers only for DNS.

Simon.

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