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Troubleshooting Question

Exchange DAG and High Availability?

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Last Modified: 2020-10-26
Hey, experts! So, I have a DAG going between two Exchange servers. Both healthy and replicating. Tested making one the active mailbox db with success. My issue is, though, when one the secondary, newer Exchange server (hosting mailbox db copy) is offline, Outlook or OWA won't connect, effectively stopping mailflow/email capability. What am I missing here?
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MASEE Solution Guide - Technical Dept Head
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Hidden (Mike)Senior Systems Engineer

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Commented:
2016 - CU15
Load balance servers... that I didn't know to do :((((((
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Jeff GloverSr. Systems Administrator
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Commented:
Which server is DNS pointing to for OWA and Outlook Anywhere?
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You will get the IPs using the below commands
Get-Outlookanywhere | fl internalhostname,externalhostname
nslookup
mail.domain.com

Following is a screenshot of the same from my server. In your case you will get 4 results as you have 2 servers.


Hidden (Mike)Senior Systems Engineer

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Commented:
Ok, so, looks as if I'm lacking this extra mile for HA, assuming it'd be a function of DAG. DNS is pointing to the first server for OWA - we're not using Outlook Anywhere. Looks like I need to load balance, then! Yay to learning more stuff! Thanks, everyone.