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T-diag says unable to change IP-Address

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Hello,

In the past I have worked with a T-Diag and it all worked fine. A month ago I wanted to use it agian but now it doesn't work any more. When ever I try to make contact with the car or if I try to put it in to Factory mode I keep getting the message 'unable to change IP Address'.
Does anyone know how to fix this?
The car is a Tesla Model S 2014