The content of the ccSubSDK folder are piling up with files. This is the folder where submissions are staged for delivery to Symantec.
Default Folder Path: C:\ProgramData\Symantec\Symantec Endpoint Protection\CurrentVersion\Data\CmnClnt\ccSubSDK
The machine does not have access to the internet, or communication to the internet is broken.
This may also be caused by a rapid increase in submissions due to a threat outbreak or false positive detection.
Ensure the correct proxy settings are set under Proxy Server tab in External Communications section for the specific SEPM group.
This issue is fixed in Symantec Endpoint Protection (SEP) 14.3 RU1. For information on how to obtain the latest build of Symantec Endpoint Protection, see Download the latest version of Symantec software here.
To workaround this issue:
Some environments may experience an accumulation of files in the ccSubSDK folder despite an open connection to Symantec submissions URLs. Work around this with other steps above, and/or a Windows folder quota to limit a backlog of submissions. This article will be updated as new information becomes available.