I have exchange 2013 server (2MB, 2CAS) server. I created two dns records for mail.test.com, autodiscover.test.com pointing to my two CAS servers.

But the problem is if i switched of one cas server, client outlook not connecting automatically to other CAS server. By restarting the outlook also its not working. By restarting the system or running the command ipconfig /flushdns in command prompt, it working.

is there any configuration iam missing, please advice how to achieve decent load balancing in Exchange 2013 CAS without going for third party Loadbalancer...

I have exchange 2013 server (2MB, 2CAS) server. I created two dns records for mail.test.com, autodiscover.test.com pointing to my two CAS servers.

But the problem is if i switched of one cas server, client outlook not connecting automatically to other CAS server. By restarting the outlook also its not working. By restarting the system or running the command ipconfig /flushdns in command prompt, it working.

is there any configuration iam missing, please advice how to achieve decent load balancing in Exchange 2013 CAS without going for third party Loadbalancer...

If a CAS role server is down or unable to service clients, you have to remove it from  DNS round-robin consideration manually. There is no health check with DNS round-robin unlike a true load balancer.

Also, I would set the TTL to a low value for the CAS servers in the round-robin.

Hi

How to reduce TTL value only for mail & autodiscover records..

Hi

How to reduce TTL value only for mail & autodiscover records..

That would be set in DNS.

Run the dnsmgmt.msc console on the DNS server, enable View > Advanced. After that you can set TTL (5 mins) for the each desired DNS-record.

But that is only one part of solution.

As said Andy David, in the absence of true load balancing you must (temporarily or permanently) remove corresponded DNS record in the case of out-of-service CAS-server.

I am same situation regarding the CAS load balancing. I didn't get the point to temporarily or permanently remove the DNS record. If remove the record how the user will connect to CAS server that point to outlook or OWA user.

Kindly suggest best possible solution as I need to implement CAS array without HLB.

Thanks