Rsyslog remote logging via tcp not working - plz help

I have a "central syslog server" that listens on udp 1514 and tcp 1468

All SUSE Linux Servers are sending their logs to "central syslog server"  via tcp(1468). SUSE servers uses

'syslog-ng', with following configuration

destination LOGHOST { tcp("IP.OF.Syslog.Server" port(1468)); };
log { source(src); destination(LOGHOST); };

But none of the rhel boxes are sending their logs over tcp 1468.  rhel6.4 boxes are configured as:

*.info   @@IP.OF.Syslog.Server:1468

it works when I configured the rhel boxes to send the logs over udp

*.info   @IP.OF.Syslog.Server:1514

Please help