Connection to SQL Server requires TCP communication on port 50235?
Are you connecting to a named instance?  In which case, the initial connection is to the SQL Server Browser service (UDP 1434) and then that dynamically allocates a port for named instances.  This port is allocated on instance startup.

See this TechNet Resource on how the SQL Server Browser Service allocates a port for named instances.

There is a way to explicitly define a static port that a named instance will be listening on, but it appears that you are seeing a dynamically allocated port.