TeamCity – Build agent disconnected

Bellow is how I resolve my problem with TeamCity – Build agent disconnected.

TeamCity Agent Disconected

ssh to my centos agent machine.
Go to agent folder, in this case it is BuildAgent
I tried to stop the agent by bin/agent.sh stop but got no luck. When I started the agent it said that Build agent is already running with PID 1795, so that I could not restart it.
KILL the process by sudo kill 1795
Restart again bin/agent.sh start
=> It should work now.