When using RLTP/ALTP for log transport with version 6.0.x of the Syslog-ng Agent for Windows, the following error occurs:
Server close the connection; status_code='510', error='TID is already used\x0a'
At this time there is no resolution for this issue.
Please disable using RLTP/ALTP at this time. When using the Syslog-ng Agent for Windows, only TCP and TLS should be selected.