After installing a new license and attempting to restart Syslog-ng, the restart fails and the following error is reported.
# service syslog-ng restart
Error validating license; error='This license is not valid for this program (product=syslog-ng, version=Rolling)'
The license file is not compatible with the installed version of Syslog-ng PE
A ‘Rolling’ license is for Syslog-ng PE version 7.
Licenses for version 6 specify the license number.
See the following KB article for details about the data contained in a license file.
This can be downloaded from the support portal.