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DAG Failover Adapter taking Precedence

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DAG Failover Adapter taking Precedence - 1.Jun.2012 3:25:07 AM   
andytruelove

 

Posts: 7
Joined: 17.Apr.2010
Status: offline
Hi

We had a power failure on our Exchange Servers last night and since then we have an odd problem with networking on the cluster. We're running a two Exchange Server DAG with two DC's and a single Witness Server. On the primary Exchange Server (EX01) when we ping the primary domain controller (DC01) the address is returned as 169.x.x.x which I've traced to the Microsoft Failover Virtual Adapter\Network. Strangely when I ping the other DC's or the other Exchange Server I get the correct 10.173.x.x address back. I've checked the order with nvspbind and it tells me the Failover Adapter is already at the bottom of the binding list with the "LAN" connection at the top.

This is causing us a couple of problems (or at least I think this is the cause of the problems) including the clients can't connect to EX01 with Outlook Anywhere, clients can't connect to the Public Folder on EX01 and the DAG is saying that EX01 adapter is offline. Strangely MAPI connections, SMTP connections and OWA are working fine on EX01. We've failed over to EX02 which (fortunately) has worked OK but need to get this sorted asap for the public folder access.

Has anyone else encounterd this and found a fix? Any suggestions greatly appreciated.

Andy Truelove.
Post #: 1
RE: DAG Failover Adapter taking Precedence - 4.Jun.2012 8:21:34 AM   
travis.sheldon

 

Posts: 359
Joined: 16.Sep.2010
Status: offline
Does NSLOOKUP yield the correct result? If so, check that you dont have an entry in the hosts file

(in reply to andytruelove)
Post #: 2
RE: DAG Failover Adapter taking Precedence - 6.Jun.2012 10:41:51 AM   
John Weber

 

Posts: 1236
Joined: 20.Apr.2005
From: Portland, Oregon
Status: offline
Assuming you mean the replication network adapter and the MAPI/regular traffic adapter, do you have a gateway on the replication NIC?

IME, I use MAPI and REPL (as names). The REPL NIC should only have an IP and a mask, no GW. If you need to get the REPL network routed around you add persistent routes. Otherwise, having two gateways creates "issues" such as you are seeing. Especially if both networks are listed in AD Sites and Services as valid site subnets.

_____________________________

John Weber [Lync MVP] http://tsoorad.blogspot.com

(in reply to andytruelove)
Post #: 3
RE: DAG Failover Adapter taking Precedence - 12.Jun.2012 6:27:47 AM   
clementrosario

 

Posts: 126
Joined: 13.May2007
Status: offline
Andy,

I guess there is some configuration changes in the DAG network.Make sure you have given the Static IP. If you have assigned the DHCP address please make it reserved.

Run Exbpa for configuration changes.
If administrative share is disabled the AutoShare registry value will be 0, it has to be modified to 1.
http://technet.microsoft.com/en-us/library/aa997392(v=EXCHG.80).aspx

Test Outlook Anywhere in
https://www.testexchangeconnectivity.com/

Check the network output
Get-DatabaseAvailabilityGroupNetwork -Identity DAG01\DAGNetwork01 -Server EX01 | fl

(in reply to andytruelove)
Post #: 4

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