Forum Discussion
juan_47813
May 10, 2012Nimbostratus
Problem Outlook Exchange 2010
Hello.
First of all, sorry for my English.
We've a customer who has a Exchange 2010 service for his users: OWA, RPC, etc.
He has two CAS servers, using Windows NLB technology.
The idea is to migrate to a F5 load balanced service.
I've created all of services following the deployment guide (LTM v11).
All seemed to work fine, but in the end a few Outlook clients didn't work properly: the following message appears -> "Outlook is unable to connect to Exchange server" (something like that).
It's curious because it only fails from some determined PC's; some PC's in the same VLAN work fine. All outlook profiles you create in "the bad PC's" don't work. We changed the IP address and we obtained the same result.
Is it necessary to carry out additional changes of configuration on the CAS servers?
Anyone can help us, please?
Thank you all.
- TechgeeegNimbostratusHi Juan,
- juanNimbostratusHi Faisal.
I'll describe better the situation:- We have two CAS servers, load balanced as Windows NLB- The idea is to use F5 LTM as load balancing technology.- I've set all Exchange services: OWA, Autodiscover, RPC, etc.. following the deployment guide: http://www.f5.com/pdf/deployment-guides/microsoft-exchange2010-iapp-dg.pdf.- Everything seems to work fine, except that some clients using Outlook 2010 can not connect to exchange server.- The strange thing is that it always fails from the same computerd. From computers on the same VLAN, some fail and others do not.- We have logged the connections. When using the Outlook 2010 client, always begins with an RPC connection to port 135.- In the good and correct situation, there are connections to RPC ports 7575 and everything works fine.- In the bad situation, there are only attempts of RPC connections to port 135 and a message appears on the client, something like "Outlook can not connect to the Exchange server."We have seen the following message captured with Network Monitor "DCERPC174Bind_ack: call_id: 2 Fragment: Single Unknown result (3), reason: Local limit exceeded"Can you help us? Have you had any similar cases?Our suspicion is that the problem may be related to any further modification to be carried out in the CAS server configuration, something related to authentication and FQDN. - TechgeeegNimbostratusHi Juan,
- natheCirrocumulusJuan
- juanNimbostratusHi Faisal.
- TechgeeegNimbostratusHi Juan,
- juanNimbostratusHi.
- TechgeeegNimbostratusHi Juan,
- juanNimbostratusHi everybody.
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