The port is already in use appears in the Serv-U logs and users cannot connect

10/11/2021 4:57 PM

11/8/2021 10:26 PM

There are some cases that the user was not able to connect to Serv-U, and then in the Serv-U logs, it shows the port is already in use for some reason. Rebooting the server would correct the issue, but sometimes it is not, or eventually, it will occur again.

Serv-U Managed File Transfer & Serv-U FTP Server

Port conflict with other processes in the OS.

Reboot the server, or close/terminate the other processes that are using the same port.

To close/terminate the other processes.

1. Open the CMD.
2. Type the command below (replace the port number in question).

netstat -ano | findstr port_number

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3. Run the task manager, select the Details tab.
4. Find Serv-U.exe, check the PID, and compare with the netstat results.

5. If it's different from Serv-U PID, terminate the PID.
6. Find the PID number in the task manager, right-click and then select End Task.
7. You can also terminate it permanently by going to Windows Services.
8. Find the service that is running and open the properties.
9. Select the Startup type to Disable, click Apply, and OK.