The answer to your question lies in the same dialogue shown by the browser:
It tries to open an encrypted communication (so a safe one) to the ctrlX CORE but the certificate of the client (ctrlX CORE) is self signed by Rexroth and is not known in the world wide web. So it tells you it cannot check on the certificate servers in the internet, that this one s known and trusted in the global web. Thats why it says it could be "not secure".
So we cannot change this, because Rexroth cannot make a certificate for each IP on each ctrlX CORE that customer possibli wants to use and reserve this in the internet.
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