After upgrade to Server VDA 7.16, multiple published applications/desktop sessions randomly get disconnected. The disconnects happen immediately after a Policy Refresh. The users are immediately able to reconnect to their sessions.

The issue has been resolved as outlined in CTX231127. 

Problem Cause

The VDA’s ICA Listeners are restarted causing all of the sessions on VDA to get disconnected at once.  The VDA’s Event Log will show events for all the sessions disconnecting, followed by the ICA Listener being stopped and then started:

applog.csv  1054  Information,7/12/2017 4:11:58 p.m.,Citrix Desktop Service,1049,None,The session '36d9ed0c-5fba-4ddb-af51-d03ca04ef033' was disconnected.
applog.csv  1055  Information,7/12/2017 4:11:57 p.m.,Citrix Desktop Service,1049,None,The session 'ca28a1c3-0347-4235-88b7-dde1b6a735e7' was disconnected.
applog.csv  1060  Information,7/12/2017 4:11:56 p.m.,Citrix Desktop Service,1049,None,The session '27de3ab0-7854-4b62-8e9b-a442fbfc7753' was disconnected.
applog.csv  1066  Information,7/12/2017 4:11:54 p.m.,Citrix Desktop Service,1049,None,The session '0e11b36f-3dbd-4add-acfc-89589b1ac79f' was disconnected.
applog.csv  1067  Information,7/12/2017 4:11:54 p.m.,CitrixCseEngine,11,None,The Citrix Group Policy service completed RSOP calculation for computer.
applog.csv  1068  Information,7/12/2017 4:11:54 p.m.,CitrixCseEngine,10,None,The Citrix Group Policy service started RSOP calculation for computer.