RUT240 is online, but not connecting to RMS

NETWORKING SOLUTIONS
8

Thanks for your reply, my answers:

  1. Yes, sufficient credits available
  2. APN is accessible, which shows all the other active routers
  3. yes, I can confirm this. But maybe this leads us to the reason. Because I did a firmware update and only afterwards the router did not connect any longer to RMS. Then I deleted the router and added it again, without success.