During the primary tests for migrating Unified agent(UA) users to WSS agent(WSSA), it was noticed that the VPN connection to Microsoft Direct access servers on IPv6 became unstable when using WSSA.
All worked well in the same setup using Unified Agent.
When problem occurs, connection establishment to Microsoft Direct Access server take more than 10 minutes to complete when successful, and the connection keep disconnecting.
Impacted WSSA versions: 6x and 7.x
Temporary workaround is to install WSS agent v 5.1.1, which should end of support on 7/28/2021.
WSSA version 5.1.1 has some known issues that were fixed on the following releases.
Below the top 5 well known issues on version 5.1.1 with their proposed workarounds:
For more information about WSSA version that follows version 5.1.1, you may refer to https://techdocs.broadcom.com/us/en/symantec-security-software/web-and-network-security/web-security-service/Help/Release_Notes_0/RN_UA_fixes.html