How KSC Agent connecting to the server by IP or server name or how?

[Mahmoud]

How KSC Agent connecting to the server by IP or server name or how?

[aehrlich]

It does the way you specify the server’s address when installing/reconfiguring the agent. You can use either name or IP.

[alexcad]

to change the server- address at a later time, you can use the klmover.exe utility on the client device ...
https://help.kaspersky.com/ksc/12/en-US/3911.htm

… or the “Change Administration Server” task in KSC
https://help.kaspersky.com/ksc/12/en-US/3910.htm

FQDN is usually the best choice.
 

regards
Alex