A hypen (minus sign) is substituted whenever you use a percent sign, pound
sign, or underscore in a computer name during an initial installation of
Windows NT. For example, %MYNAME, MYNAME#1, and MYNAME_1 become,
respectively, -MYNAME, MYNAME-1, and MYNAME-1.
It is not possible to add a percent sign, pound sign, or underscore into
the DNS Host Name even though the Server Installation Guide does not list
them as invalid characters.
If you try to insert an invalid character, the following error is
The parameter is incorrect.
Another symptom occurs when you attempt to connect to a newly created Web
server with an invalid character in the computer name. You are unable to
connect to HTTP://SERVER#1, but you can connect to HTTP://SERVER-1.
The cause of this error message is given in RFC 952, which states:
A "name" (Net, Host, Gateway, or Domain name) is a text string up
to 24 characters drawn from the alphabet (A-Z), digits (0-9), minus
sign (-), and period (.). Note that periods are only allowed when
they serve to delimit components of "domain style names". (See
RFC-921, "Domain Name System Implementation Schedule", for
background). No blank or space characters are permitted as part of a
name. No distinction is made between upper and lower case. The first
character must be an alpha character. The last character must not be
a minus sign or period. A host which serves as a GATEWAY should have
"-GATEWAY" or "-GW" as part of its name. Hosts which do not serve as
Internet gateways should not use "-GATEWAY" and "-GW" as part of
their names. A host which is a TAC should have "-TAC" as the last
part of its host name, if it is a DoD host. Single character names
or nicknames are not allowed.
DOD INTERNET HOST TABLE SPECIFICATION:
This RFC is the official specification of the format of the Internet
Host Table. This edition of the specification includes minor
revisions to RFC-810 which brings it up to date. Distribution of this
memo is unlimited.
By design, the Microsoft Windows NT DNS Hosts Configuration utility
replaces all invalid characters in the DNS host name found in the NetBIOS
computer name with a hyphen. If you want your NetBIOS and DNS host names to
match, you must use the DNS naming standard outlined in RFC 952 when
creating your NetBIOS computer name.
In the DNS Configuration dialog box for the TCP/IP Protocol in Control
Panel Network, change the host name to a valid string of characters.
For further information on RFC Documents, reference: http://www.rfc-editor.org/