There is some new development regarding this matter.
Select Event Source to other cells is working fine. But I am still wondering why we see those messages in the Logs.
Do you continue to see the errors in the logs? It sounds like an connection issue to the TSPS server. This could be caused by any number of issues. We have seen similar errors which were caused by the following:
1) Confirm that hostname resolution is working from each machine to the other (DNS/hosts file)
2) If there is a firewall between them, please ensure that the 80/443 port is open between them.
3) Check if you can ping the FQDN from TSPS server to TSIM and vice versa.
4) Try HTTP protocol with port 80 and increase the connection timeout to 5 or 10.
5) Confirm that RSSO has been installed & configured for TrueSight.
If all of the above has been checked, then send the logs folder for both TSPS and TSIM to BMC Support.