dcdiag fails connectivity test

Paul MacFarlane · Joined: 05 Aug 2007 Posts: 10

I'm trying to resolve a problem with our exchange server not authenticating
accounts in the AD...

One minute users can open Outlook and connect to exchange, the next they
can't....
Resetting the network connection and simply pinging the DC seems to resolve
the problem temporarily.

dcdiag results:
Testing server: Default-First-Site-Name\MHDC
Starting test: Connectivity
The host 45b9f6e2-5f64-4aac-b689-8e9f5af0f55e._msdcs.mullenlaw.com
coul
d not be resolved to an
IP address. Check the DNS server, DHCP, server name, etc
......................... MHDC failed test Connectivity

Sometimes the message is a little different:

Testing server: Default-First-Site-Name\MHDC
Starting test: Connectivity
The host 45b9f6e2-5f64-4aac-b689-8e9f5af0f55e._msdcs.X could not be
resolved to an
IP address. Check the DNS server, DHCP, server name, etc
Although the GUID DNS Name (45b9f6e2-5f64-4aac-b689-8e9f5af0f55e._msdcs.X)
could not be resolved, the server name (mhdc.X) resolved to IP address
(192.168.10.6) and was pingable. Check that the IP address is registered
correctly with the DNS server.
......................... MHDC failed test Connectivity

Checking the DNS server, there is a CNAME entry there.

We are also getting LDAP events (article 272552) and the Recipient Update
Services if pointed to the same server....

Any help would be appreciated..

Paul

Archived from group: microsoft>public>exchange>setup

John Oliver, Jr. [MVP] · Joined: 05 Aug 2007 Posts: 823

Did you download and run ExBPA against your Exchange Server? What version
of Exchange and OS of system?

--
John Oliver, Jr
MCSE, MCT, CCNA
Exchange MVP 2008
Microsoft Certified Partner

"Paul MacFarlane" wrote in message
news:%23g9oQ3VeIHA.3368@TK2MSFTNGP02.phx.gbl...
> I'm trying to resolve a problem with our exchange server not
> authenticating accounts in the AD...
>
> One minute users can open Outlook and connect to exchange, the next they
> can't....
> Resetting the network connection and simply pinging the DC seems to
> resolve the problem temporarily.
>
> dcdiag results:
> Testing server: Default-First-Site-Name\MHDC
> Starting test: Connectivity
> The host 45b9f6e2-5f64-4aac-b689-8e9f5af0f55e._msdcs.mullenlaw.com
> coul
> d not be resolved to an
> IP address. Check the DNS server, DHCP, server name, etc
> ......................... MHDC failed test Connectivity
>
> Sometimes the message is a little different:
>
> Testing server: Default-First-Site-Name\MHDC
> Starting test: Connectivity
> The host 45b9f6e2-5f64-4aac-b689-8e9f5af0f55e._msdcs.X could not
> be resolved to an
> IP address. Check the DNS server, DHCP, server name, etc
> Although the GUID DNS Name (45b9f6e2-5f64-4aac-b689-8e9f5af0f55e._msdcs.X)
> could not be resolved, the server name (mhdc.X) resolved to IP address
> (192.168.10.6) and was pingable. Check that the IP address is registered
> correctly with the DNS server.
> ......................... MHDC failed test Connectivity
>
> Checking the DNS server, there is a CNAME entry there.
>
> We are also getting LDAP events (article 272552) and the Recipient Update
> Services if pointed to the same server....
>
> Any help would be appreciated..
>
> Paul
>
>
>
>
>

Paul MacFarlane · Joined: 05 Aug 2007 Posts: 10

Thank John...

No I haven't. I will because we are currently on Ex2003 and going to 2007
soon.

We did resolve the problem. It turns out it was a problem with a NIC
driver. A W2k3 update was incompatible with older drivers...
James in the connectivity group told me about it...

Paul

"John Oliver, Jr. [MVP]" wrote in message @TK2MSFTNGP03.phx.gbl...
> Did you download and run ExBPA against your Exchange Server? What version
> of Exchange and OS of system?
>
> --
> John Oliver, Jr
> MCSE, MCT, CCNA
> Exchange MVP 2008
> Microsoft Certified Partner
>
>
> "Paul MacFarlane" wrote in message
> news:%23g9oQ3VeIHA.3368@TK2MSFTNGP02.phx.gbl...
>> I'm trying to resolve a problem with our exchange server not
>> authenticating accounts in the AD...
>>
>> One minute users can open Outlook and connect to exchange, the next they
>> can't....
>> Resetting the network connection and simply pinging the DC seems to
>> resolve the problem temporarily.
>>
>> dcdiag results:
>> Testing server: Default-First-Site-Name\MHDC
>> Starting test: Connectivity
>> The host
>> 45b9f6e2-5f64-4aac-b689-8e9f5af0f55e._msdcs.mullenlaw.com coul
>> d not be resolved to an
>> IP address. Check the DNS server, DHCP, server name, etc
>> ......................... MHDC failed test Connectivity
>>
>> Sometimes the message is a little different:
>>
>> Testing server: Default-First-Site-Name\MHDC
>> Starting test: Connectivity
>> The host 45b9f6e2-5f64-4aac-b689-8e9f5af0f55e._msdcs.X could not
>> be resolved to an
>> IP address. Check the DNS server, DHCP, server name, etc
>> Although the GUID DNS Name
>> (45b9f6e2-5f64-4aac-b689-8e9f5af0f55e._msdcs.X) could not be resolved,
>> the server name (mhdc.X) resolved to IP address (192.168.10.6) and was
>> pingable. Check that the IP address is registered correctly with the DNS
>> server.
>> ......................... MHDC failed test Connectivity
>>
>> Checking the DNS server, there is a CNAME entry there.
>>
>> We are also getting LDAP events (article 272552) and the Recipient Update
>> Services if pointed to the same server....
>>
>> Any help would be appreciated..
>>
>> Paul
>>
>>
>>
>>
>>
>
>

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