Issues with license server

Well, perhaps I picked the wrong thread, but I am pretty certain that I saw someone with the same issue as you somewhere…
If you search the forum a little, maybe go back 2 or 3 months, if I recall properly, you’ll find an answer to your question.

Check this thread :

…and see if it ain’t your anti-virus blocking the connection.

. . . . . . . . . . . . . .

If this is no help,

…have you tried reinstalling to that one computer ?
…or look for what is different in that one computer vs the two others (OS settings etc) ?