Hello,
There was nothing to solve from Web IDE side, if that is what you meant.
The problem was with missing authorizations to reach the sap/bc/adt/discovery.
If you want to check whether this is the same issue you have, please do as requested from other users and try to reach the /sap/bc/adt/discovery directly from your system's host and port and not via Web IDE, and see if you get a response. If you do get a valid response please attach it here for further analysis.
Thanks,
Michal.