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BugZero found this defect 1206 days ago.
During the initial installation of Veeam applications, the install wizard has a page where service ports may be specified. When moving to the next page of the install wizard, an error may be displayed regarding a Selected port not being available.
Upon clicking [Next] on the page of the installer where ports are defined, the installer checks if the specified ports are in use. The pop-up error occurs If a port is detected as being in use.
Identify and terminate the process using the port related to the error, then proceed with the installation of the Veeam software. The following PowerShell script can be used to identify the process identifier number (PID) and process name using the specified port.