Hello, In the project we try not to break any past configuration, thus providing a compatibility. (Not always a success story there) Upgrading from versionA to versionB in general should work. But we do not provide guarantee that they are in fact compatible, nor there is a document that list configuration changes (well release note recently can help). In fact, as we do rolling release there is not much support for either of those version. Meaning that we do not do bugfixes for them. We fix bugs on the latest version. In short: Is there any compatibility between ver3.2's syslog-ng.conf and ver3.25's syslog-ng.conf? Yes, should be. But if you run into an issue that likely won't be fixed in 3.25. -- Kokan ________________________________________ From: syslog-ng <syslog-ng-bounces@lists.balabit.hu> on behalf of leis <okada.takatsugu2110@gmail.com> Sent: 24 June 2021 21:28 To: syslog-ng@lists.balabit.hu Subject: [syslog-ng] Is there any compatibility between ver3.2 and ver3.25 about syslog-ng.conf? CAUTION: This email originated from outside of the organization. Do not follow guidance, click links, or open attachments unless you recognize the sender and know the content is safe. Hello, I am looking to migrate my environment from CentOS5 syslog-ng ver3.2 to ubnutu20.02 syslog-ng ver3.25. But when I use syslog-ng.conf of ver3.2 to syslog-ng.conf of ver3.25, syslog-ng cannot start. Is there any compatibility between ver3.2's syslog-ng.conf and ver3.25's syslog-ng.conf? Thanks