Passwords containing ':' are not read properly

Since userid and password are read as index 0 and 1 of credentials.split(':') the remaining part of the password after ':' is discarded.

Locate the authentication parsing code that uses credentials.split(':') and inspect how the username and password are extracted. Confirm the expected behavior for passwords containing colons, then add coverage showing that the complete password is preserved and run the relevant project tests.

Written by the indexing model from the issue text.