XRootD follows RFC 952 for host name conventions. RFC 952 specifically 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. "

Hence, the host name you provided is invalid if it starts with a non-alpha character. The full RFC can be found here: http://tools.ietf.org/html/rfc952


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