This functionality is supported only if you are using the Classic Agent.
Silk Test Classic connects to each Agent through a TCP/IP port that has a 4-digit or 5-digit ID. Typically, all the machines in your testing network automatically use the same default port number. This allows the Connect function to automatically specify the port number for all connections. If some other application on one of your machines has already used the default port number, you have a port number conflict.
If you start an Agent on a PC and the default port is already in use, an error message is displayed.
In either case, you can use a different port number just for this machine, while using the default number for the rest, or you can have all your machines use the same available port number. When you have an Agent that uses a port number which is different than the default port number, you must specify the port number in every reference to that Agent. The syntax is AgentName:nnnn where AgentName is the target machine name and nnnn is the port number. Since you typically use a file or a list variable to hold your Agent names, you can add the :nnnn where needed.
If there are no port conflicts, you do not have to specify ports. If you have a conflict, the port number used for that machine must change. You can choose to change the port numbers used by all your PCs and workstations so that all use the same number.