UCWA client can’t make a P2P call or join a conference when EnableExternalAccessCheck is True and EnableOutsideAccess is False in Skype for Business Server 2015

Applies to: Skype for Business Server 2015


You set the EnableExternalAccessCheck parameter to True and set the EnableOutsideAccess parameter as False in Microsoft Skype for Business Server 2015. In this scenario, a Skype for Business on Mac user can’t make a peer-to-peer (P2P) call or join a conference. This issue only occurs after you install the July 2018 cumulative update for Skype for Business Server 2015 (CU7).


To fix this issue, install the July 2019 cumulative update 6.0.9319.559 for Skype for Business Server 2015, Web Components Server.


To work around this issue, you can enable the EnableOutsideAccess parameter in an external access policy or disable the EnableExternalAccessCheck parameter in a platform service settings configuration.