the problem is at your manager site and not at your remote location.
do a repair of your manager.
check this path.
seems like these files are deleted somehow.
C:\Program Files\Symantec\Symantec Endpoint Protection Manager\tomcat\webapps\scm\clientpkg\ext
it should have the file , if you check now it wil be empty.
do a repair of SEPM , you should be able to access the console.