Multiple owa Access

Fatih Demir 1

Hi,

I have 3 domain (let's call a.com, b.com, c.com) on Exchange Server 2016 and want to create multiple owa access for these different domain users. (like mail.a.com/owa, mail.b.com/owa, mail.c.com/owa)

Currently my default owa address is https://servername/owa. I tried the following articles and created iis sites and virtual directories for each one. I can't connect any of these owa addresses I mentioned above.

https://johnyassa.wordpress.com/2012/06/07/publish-multiple-owa-ecp-virtual-directories-on-one-exchange-2010-cas-server/
https://techcommunity.microsoft.com/t5/exchange-team-blog/configuring-multiple-owa-ecp-virtual-directories-on-the-exchange/ba-p/611217

How can I configure correctly this setup?

Thanks.

Kael Yao-MSFT 37,491 Reputation points Microsoft Vendor

2021-09-09T03:23:59.7+00:00

Hi @Fatih Demir

Can you access OWA using the owa addresses from internal?
If not either, what is the detailed error message in browser?

And just in case, have you created the corresponding DNS records?
Fatih Demir 1 Reputation point

2021-09-09T10:13:05.867+00:00

I can access owa using only https://servername/owa internally. What should I do for access with https://mail.a.com/owa ?
I created A, CNAME, TXT etc. records on DNS.
Kael Yao-MSFT 37,491 Reputation points Microsoft Vendor

2021-09-10T02:48:47.403+00:00

Hi,
If you use https://mail.a.com/owa to access from internal, what is the detailed error message in browser?
For example, did it show the site is untrusted?
Fatih Demir 1 Reputation point

2021-09-10T10:20:49.357+00:00

It says can't reach this page.
Kael Yao-MSFT 37,491 Reputation points Microsoft Vendor

2021-09-14T08:42:22.95+00:00

Hi,
If you do a ping test on the client device, can the urls (https://mail.a.com/owa) be resolved correctly?

And if using the ip address binding in IIS to access OWA directly, would it still fail?
Fatih Demir 1 Reputation point

2021-09-16T13:57:09.867+00:00

I can't ping to https://mail.a.com/owa but I can ping servername.local.
How should I change main owa address to https://mail.a.com/owa and add another owa addresses for b and c domains?
Kael Yao-MSFT 37,491 Reputation points Microsoft Vendor

2021-09-17T05:45:42.1+00:00

Hi,
If you have added the correspond records in internal and external DNS server, you should be able to resolve the address (mail.a.com) via ping.

If you followed the links, you should have created additional sites and add additional ip addresses or ports for clients to access.
And the cause of not able to access the urls may possibly be the clients cannot resolve them correctly(mail.a.com,mail.b.com,mail.c.com)
Kael Yao-MSFT 37,491 Reputation points Microsoft Vendor

2021-09-22T07:43:36.933+00:00

Hi @Fatih Demir

I am writing here to confirm with you how thing going now?