Sometimes in EM, connection summary page will be completely empty and when you disbale and enable the UM connection alias in IS admin page the connections appears again in EM connections tab.
What could be the issue? and what are the consequences of this scenario in terms of trigger subscription?
sometimes, EM display inaccurate information. Have you tried restarting EM, instead of restarting ISes? Does it then show the correct connections?
Have always tried re enabling the connection alias in IS and not restarting. Then immediately we could see connections appearing in EM. Maybe we could try as you said and will get back to you if issue persists.