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Forefront TMG NLB array, The TMG firwall service needs a restart to be able to connect to the published Exchange 2007

Posted on 2010-08-30
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Last Modified: 2012-05-10
I'm finding that after rebooting the 2 server TMG array servers with NLB integrated, I have to restart one or both firewall services for the Exchange services to work.  Any advice on how to fix this?
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Question by:mbromb
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by:sunnyc7
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IMHO
I think you need to increase the points for this one to 500 atleast for other experts to dig-in.
My $.02
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by:mbromb
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I usually increase the points if there isn't a quick answer and it gets more involved.  Apparently, it's more involved.  I've upped the points. thanks
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by:mbromb
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these events are occurring on the array servers:

ON THE ARRAY MANAGED NODE:

 Log Name:      Active Directory Web Services
 Source:        ADWS
 Date:          8/30/2010 2:17:11 PM
 Event ID:      1202
 Task Category: ADWS Instance Events
 Level:         Error
 Keywords:      Classic
 User:          N/A
 Computer:      tmg2.domain.com
 Description:
 This computer is now hosting the specified directory instance, but Active Directory Web Services could not service it. Active Directory Web Services will retry this operation periodically.
 
  Directory instance: ADAM_ISASTGCTRL
  Directory instance LDAP port: 2171
  Directory instance SSL port: 2172
 --------------------------------------------------
 
 Log Name:      Active Directory Web Services
 Source:        ADWS
 Date:          8/30/2010 2:15:48 PM
 Event ID:      1400
 Task Category: ADWS Certificate Events
 Level:         Warning
 Keywords:      Classic
 User:          N/A
 Computer:      tmg2.domain.com
 Description:
 Active Directory Web Services could not find a server certificate with the specified certificate name. A certificate is required to use SSL/TLS connections. To use SSL/TLS connections, verify that a valid server authentication certificate from a trusted Certificate Authority (CA) is installed on the machine.
 
  Certificate name: tmg2.domain.com
 
---------------------------------------------------------------------

ON THE ARRAY MANAGER:

Log Name:      Active Directory Web Services
Source:        ADWS
Date:          8/30/2010 11:41:32 AM
Event ID:      1400
Task Category: ADWS Certificate Events
Level:         Warning
Keywords:      Classic
User:          N/A
Computer:      TMG1.domain.com
Description:
Active Directory Web Services could not find a server certificate with the specified certificate name. A certificate is required to use SSL/TLS connections. To use SSL/TLS connections, verify that a valid server authentication certificate from a trusted Certificate Authority (CA) is installed on the machine.
 
 Certificate name: TMG1.domain.com
-----------------------------------------------------------------------------------------

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by:mbromb
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It seems what is happening is that the 3 PCs I've been testing with are the ones that aren't working after a reboot.  Other PCs tested after are fine.  I've rebooted the test PCs, but it doesn't resolve it.
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by:mbromb
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Anyone have any idea?  It seems like a particular computer using OWA has affinity to a particular server and won't use the other server for OWA.  OWA then breaks and can't be used while the server is rebooted.  It won't bounce to the other server in the array, and restarting the browser doesn't help.  It may be that owa is only really working on the managed node and not at all on the manager node.  
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by:mbromb
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I've done some additional testing.  I tested using the direct IPs on the TMG listener rather than the cluster IP and it worked!  OWA can connect to either array server when using the direct IP, but can't seem to use the manager node when the cluster IP is used.  It seems that the NLB or the switch to cluster IP is not working correctly.  I'm going to work with the network team to see what they say.  Any other suggestions to test NLB?
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Accepted Solution

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mbromb earned 0 total points
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The issue:  A drain stop on the NLB  service for a node did not allow the OWA connected clients to bounce to the other TMG array node.  Other clients may not have been able to connect as well, possibly until the firewall service was restarted, or until the original server was accepting NLB connections again.

The resolution:  Adding the server specific IP addresses to the listener, along with the already in place cluster IPs, fixed it completely.  After making that change, an OWA client is asked for credentials when the array member it's connected to is put into drain stop.
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