IP Address as User name

Hi All I'm struggling with getting an IP address to eb accepted as a username in the clients file and suspect it's somehow being filtered but I can't find where I've create a user like: Test Cleartext-Password := "test" And using radtest can get an access-accept but when I try: 1.1.1.1 Cleartext-Password := "test" I get an access-reject and it has a noop against the files in the debug I have tried in quotes as well but no luck Can anyone point me in the right direction as the configs are quite vanilla/plain Darren