External Logging to Syslog server not working

We have symantec 12.1.6 - external logging is enabled . This was working fine until few days back when we found that no logs are

received from SEPM to RLC - Remote log Collector

Is there any troubleshooting we can do to confirm configuration from SEPM is working fine ? Is there any logs in SEPM  we can check ?

I have run through below article https://support.symantec.com/content/unifiedweb/en_US/article.TECH234688.html

however upgrade has happened some months  back and issue appeared only few days back. So I believe this is not related to the

upgrade.