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Hello Jan,

Thank you for your message.

This issue might be caused by some updates in the router settings that could've been done by the router's manufacturer.
Could you please try adding Host installation folder C:\Program Files (x86)\Remote Utilities - Host\ to your router's exception list and see if this helps to resolve the issue? In addition, please make sure that the outbound TCP ports 5655/443 are opened and not blocked by your router or used by another software.
Last but not least, this KB page can also provide some helpful solutions for the issue.

Please let us know if you have more questions.