Warning: Performing domain rename with non-RFC compliant name %1!s!. Note if you are hosting non RFC compliant DNS records ...

Warning: Performing domain rename with non-RFC compliant name %1!s!.  Note if you are hosting non RFC compliant DNS records on a DNS server that does not support these names, there may be issues with DNS functionality.  Strict RFC 1123 compliance requires that names only contain the letters a-z, or A-Z, or the numbers 0-9 or the hyphen (-) character.  Additionally, they may begin with a letter or number and no single label may be longer than 63 bytes%0