EWS inbound ACL network allow list?

[dcolpitts]

We are attempting to configure integration with Exchange 2019 on-prem for Calendar and contact access for Zoom Phone.  We currently have an ACL allow list on our inbound proxy to allow allow EWS access only from Microsoft O365 for Teams integration.  We obviously need to add Zoom now as well - where would I find the inbound IP ranges from Zoom that would be making legitimate EWS connections?

[Eliot]

hi dcolpitts,

these support articles may help.

Please see Using calendar and contacts integration

https://support.zoom.us/hc/en-us/articles/360000488243-Using-calendar-and-contacts-integration

Zoom network firewall or proxy server settings

https://support.zoom.us/hc/en-us/articles/201362683-Zoom-network-firewall-or-proxy-server-settings

Did my response answer your question? If so, please don't forget to mark the reply as an accepted solution.

thanks,  eliot

[dcolpitts]

Thanks but that is of no help.  Those articles are referring to the Zoom Client, and outgoing IP ranges.  Not inbound from Zoom to Exchange On-Prem for EWS access.

And I had already gone through both of those articles prior to posting.

[mdi]

Hello 

Do you resolve your problem.

May i have the same problem.

Zoom return me "unknown error" while i try to connect to my exchange on premise using EWS (https://webmail.mydomain/EWS/Exchange.asmx)

this URL is set in my proxy without any inbound ACL. 

[gmiller32]

I also have this issue.