The Core Concentrator account needs the following ports open on the machines being accessed:
To Control Center: Port 8087
To Windows Acquire (SMB share): Port 445
To Acquires via SSH: Port 22
To Acquires via FTPS: Port 21 or Port 990 depending whether it is implicit or explicit
To Acquires via Active FTP: Port 21
To Acquires via Passive FTP: dynamic ports (see your network administrator to set ports)
To OEM database: Port 1521
To iSeries: Port 8471
To REST API: Port 80, 8080 and 443