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OWA Add-in on Exchange2019 cu4 Initialization failed

User08151512
Level 2

Hey,

we do not get the owa add-in working. (Outlook Plugin work fine)

Error: initialization Failed

Call: /owa/service.svc?action=ExecuteEwsProxy&ID=-40&AC=1

ErrorMessage: The remote server returned an error: (401) Unauthorized.

1) Exchange 2019  CU4 OnPrem

All Servers behind Network Loadbalancer.  Virtual Directorys  External and Internal URL like (mail.contoso.com)

We did not find any helpfull hint in the Exchange OWA EWS HTTPProxy EWSProxy or IIS Logs

2) Enterprise Vail 12.5.1 Cluster

Did anyone get the OWA Addin running?

regards

Sebastian

 

 

 

3 REPLIES 3

Marcde
Level 6
Partner    VIP    Accredited

Hi Sebastian,

have you seen this one? 

Enterprise Vault Office Mail App fails to initialize

https://www.veritas.com/support/en_US/article.100031398

Personally haven't had this one so far. We managed to sort out some topics in the past or at least got closer to the root cause by following this approach here when troubleshooting issues like this, though I am not completely certain this still completely applies to Exchange 2019:

Troubleshooting Exchange 2013 Mail Apps – ExecuteEwsProxy calls

https://blogs.msdn.microsoft.com/emeamsgdev/2014/09/19/troubleshooting-exchange-2013-mail-apps-exec...

 

Regards

Marc

PMCS GmbH & Co. KG - A Serviceware Company
www.serviceware.de

Hi Marc,

thank you for reply.

We know that artikel but its not working for us. All Exchange servers are only acessible by the external url.

regards

sebastian

Marcde
Level 6
Partner    VIP    Accredited

Hi Sebastian,

please excuse the missing reply. 

Are you able to contact Veritas technical support to discuss the topic? They might be able to help you understanding if some kind of workaround can be applied. I believe due to your configuration the internal communication between the servers is broken at some point. I thought I'd remember a similar situation from the past but are currently not able to locate more details. Whenever I find something I'll let you know.  

 

Regards

Marc

PMCS GmbH & Co. KG - A Serviceware Company
www.serviceware.de