If you want to add, edit or delete your Receiver profile on the Website using opensky-network.org/receiver-profile it fails with the error message "Could not connect to MySQL Server"
We're always working on these errors but sometimes they aree hard to find/fix. Certainly, they seem to be temporary, so if you've had issues, you should try some time later.
Maybe invite some more people to be admins? MySQL connect errors are basic, this isn't some complicated coding issue, your script can't open a connection.. wrong password, server down, wrong permissions, there are not many options
Sometimes a server just fails and it takes some time to fix. In any case, editing your profile/receivers should work again. Let us know if you're still experiencing any errors.