Symantec Endpoint Protection Manager (SEPM) scheduled reports, when emailed, only shows "An unknown error occurred." message and there is no data in the report. Running the same report in the SEPM returns the report as expected with no errors.
Symantec Endpoint Protection Manager (SEPM) version prior to 14.3 RU8.
The issue occurs when the report content length of the emailed report is more than 3300734 characters.
This issue is resolved in Symantec Endpoint Protection Manager 14.3 RU8.
To workaround this issue on older versions, increase the related character limits in the PHP configuration file:
1. Add the following value to <SEPM folder>\Php\php.ini
pcre.backtrack_limit=10000000
2. Then restart the "Symantec Endpoint Protection Manager" and "Symantec Endpoint Protection Manager Webserver" services