[syslog-ng]syslog-ng solaris clients

Hi, I set up a central syslog-ng server (syslog-ng-1.6.0rc1) on Redhat 7.3. It works good for all remote Linux clients, but it didn't work with remote Sun Solaris clients. The central syslog-ng server couldn't receive any log messages from solaris machines. Does anyone knows what is the problem? Should I do something more or different on remote Solaris clients than remote Linux clients? Thanks for your help.