Unity Connection 8.6 - Office 365 UM Integration - Strange IPv6 DNS Resolution

[Kirill Klimakhin]

Hi everyone, 

I am integrating Cisco Unity 8.6 with Microsoft Office 365 and I am getting a strange IPv6 issue that is preventing the system from accessing the mailbox in the could. 

All the instructions were followed, and the hosted exchange server was configured as "outlook.office365.com" 

When I go to test a user with UM setup for this integration, the Unity server tries to connect to the hosted exchange server using it's IPv6 address: 2a01:111:f400:840::2:

Here's the test result:

Some possible reasons for 503: Server busy. Service offline. Attempting access using HTTPS when HTTP is required.

HTTP status=[503 Service Unavailable] Diagnostic=[Couldn't connect to server -- Failed to connect to 2a01:111:f400:840::2: Network is unreachable] 

I looked it up and 2a01:111:f400:840::2: is indeed outlook.office365.com. 

My Unity server is NOT setup for IPv6. When I test from CLI, IPv4 DNS resolution is working:

admin:utils network ping outlook.office365.com

PING outlook-namnortheast.office365.com (132.245.4.130) 56(84) bytes of data.

Any ideas on how to stop it from getting an IPv6 address?

[jrezab]

Known issue...

please see:

https://supportforums.cisco.com/discussion/11901446/cuc-upgrade-862es4422900-44-86224092-1-failing

Microsoft dns is replying with ipv6 first.. 

either use ip addresses or upgrade to 9.x unity connection.

[Kirill Klimakhin]

Thank you for your reply. When I do a lookup, I see the IPv6 addresses first:

> outlook.office365.com
Server:  [10.7.7.240]
Address:  10.7.7.240

Non-authoritative answer:
Name:    outlook-namnortheast.office365.com
Addresses:  2a01:111:f400:854::9
          2a01:111:f400:854::12
          2a01:111:f400:878::6
          2a01:111:f400:878::9
          2a01:111:f400:88c::9
          2a01:111:f400:16::2
          2a01:111:f400:16::12
          2a01:111:f400:2a::9
          2a01:111:f400:840::2
          2a01:111:f400:840::9
          132.245.8.9
          132.245.8.12
          132.245.8.166
          132.245.8.169
          132.245.9.233
          132.245.13.217
          132.245.3.210
          132.245.3.220
          132.245.4.130
          132.245.4.137
Aliases:  outlook.office365.com
          outlook.office365.com.glbdns.microsoft.com

If I set the server as one of the IPs listed above, I get the following error from CUC test:

Diagnostic=[SSL connect error -- Unknown SSL protocol error in connection to 132.245.8.9:443 ] Verb=[POST] url=[https://132.245.8.9/EWS/Exchange.ASMX] 

[justinwasden]

Were you able to resolve the issue? I am setting up a connection to a hosted Exchange environment and I am getting:

"Diagnostic=[SSL connect error -- Unknown SSL protocol error in connection to x.x.x.x:443"

I have verified the URL and login.

thanks