Exchange, not Exchanging

Hi Experts,

Weird one... I have never seen this behavior before

Here's what we have 3 x Exchange 2010 (WNLB) CAS Array & 3 x Exchange 2010 MBX Servers in a DAG - all running on wIN 2008 R2 VMWare (ESX5)

All bar 2 servers can communicate... ping, UNC paths etc... so obviously, i have a Public Folder replication issue with these 2 servers.

CAS 3 & MBX will just not "talk" to each other

I changed IP's on the CAS' NIC (updated the WNLB etc..) - no good

I added another vNIC to the CAS server, assigned an IP etc... bingo - can ping/map drives etc...  but, alas i cannot add the new NIC to the WNLB CAS Array... Grrr!

I cam across this KB article - but applicable in our case:

We are running Exchange 2010 SP3 UR2

Any ideas guys?


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Only a little question: did you use the good IP/mask for your networks?
Sometime an IP becomme unavailable because that IP is the broadcast IP if we use a specific mask.

parksvAuthor Commented:
Thanks Dan...  barring the last octet of the IP Address, all other settings across the servers are identical - same subnet - /16, same default gateway, same DNS...
parksvAuthor Commented:
Found the problem... ARP tables on both these servers had invalid MAC addressed or each other (dynamically learned) - very strange.

i created new static ARP entries & all was good.


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parksvAuthor Commented:
Issue resolved as a result of static ARP entries
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