If you freshly configured the new server settings please try rebooting the device, or send a SMS command:
(login)(password) cpureset
if you do not have login and password set simply put two spaces before the command.
If you are still experiencing issues after this, Please contact your sales manager. If you don’t have any contacts with our Sale managers, please contact with them on our official website https://teltonika-gps.com/ and click on the “Contact Us” button. When you will click, please fill the form and submit it. Note: as a topic, please choose “Vehicle telematics”. Or you can send an e-mail with description of your situation to info@teltonika.lt When contacting Us, please provide: IMEI/Configuration file/Firmware version, please follow these recommendations: Recommendations for filling a query description - Wiki Knowledge Base | Teltonika GPS