GT06 Tracker now seen as gl200 was tk103

After my router IP adress changed Traccar is working strange. My GT06 tracker is not shown on the site.
Here what I see in the log:
New message, does not work:

Tb4433020: gl200 < 89.200.312.254] 283032373034363136343737384250303033353532323730343631363437373848534f31613229

Old message works:

T085b3a84: tk103 < 31.161.186.213] 283032373034363136343737384250303033353532323730343631363437373848534f31613229

Anyone has an idea what I can change to get it to work again?

Use the correct port, like before?

Mixed two things...stupid me. One tracker is working again. Thanks.
Now try to get my GL300 back online.