In some scenarios CTAgent receives unexpected error while verifying WebSocket connection to server(s) (regardless of the fact Persistent Connection is OFF/ON) and does not fall back to standard HTTP web request.
aex-client.log contains following debug events:
DEBG 2019-04-25 05:50:26.000 12236 140371278329600 CTA-ifetcher >
Failed to obtain the list of new task instances: 2165768211, Success
DEBG 2019-04-25 05:50:26.003 12236 140371278329600 CTA-ifetcher >
Failed to connect to task server: 2165768211, WebSocket channel is not active
Cumulative pointfix attached to the article.
1. Install PF using PFInstaller2.exe to Symantec Management Platform server.
2. Enable policy [Symantec Management Agent for UNIX/Linux/Mac - Upgrade]