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Digits have been allowed as starting characters since 1989. Are you saying that xrootd rejects the relaxed restrictions indicated in RFC-1123? Please see section 2.1:

      The syntax of a legal Internet host name was specified in RFC-952
      [DNS:4].  One aspect of host name syntax is hereby changed: the
      restriction on the first character is relaxed to allow either a
      letter or a digit.  Host software MUST support this more liberal
      syntax.

      Host software MUST handle host names of up to 63 characters and
      SHOULD handle host names of up to 255 characters.

Full text: https://tools.ietf.org/html/rfc1123


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