Note the following when specifying a host name:

• The host name cannot contain a colon (:) or a comma (,), which is used as a separator, or a semicolon (;), which is used for comments.
• The host name must consist of alphanumeric characters, of which at least one must be an alphabetic character.
• The host name must end with \0.

When you do not use the host name extension function, the host name can contain a maximum of 64 characters, including \0.