The error occurs when AutoSys and WCC (WebUI) are unable to communicate despite working separately. This is frequently due to inconsistent EEM/Encryption settings or CSAM configurations between the hosts.
As noted in the documentation, you must ensure consistent EnablePmux and EnableSSL settings across all relevant hosts (AutoSys Application Server and WCC).
Run the following commands from an elevated command prompt on all hosts to align the settings:
%CSAM_SOCKADAPTER%/bin/csamconfigedit port=9000 enablessl=false enablepmux=true
%CSAM_SOCKADAPTER%/bin/csamconfigedit portrange=49152-50176 enablessl=false enablepmux=true
After applying these changes, restart WCC, AutoSys, and CSAM.
Additionally, verify that:
The AutoSys Instance name is correct in the WebUI.
Encryption settings (UseEncryption) in $AUTOUSER/config.<instance> match the Encryption option (None/Default/AES) set in the WebUI.