When attempting to open or run a file on your client machine nothing happens, or it opens and immediately and closes using Symantec Endpoint Protection (SEP).
Downloaded files are frequently blocked by the protected internet zones.
Endpoint Protection Application and Device Controls may be blocking the application.
Endpoint Protection may have detected the file or application as a threat and blocked it for your protection.
If necessary you can also Isolate the SEP components to narrow down which component (if any) are blocking your file from working normally.
Fixing files blocked by protected zones.
Changing Application and Device Control policies
Endpoint Protection detected the application or file as a threat