You told RT to expect its web traffic to come from Set($WebBaseURL , “http://deb5.localdomain”); and RT is telling you that someone is trying to access it from 178.62.201.111 hence the error. You need to adjust how you’re accessing RT to reflect your config settings or adjust the config settings to reflect you accessing RT from an IP address instead of deb5.localdomain.
You can read about each config value you have set here: