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
---
Reply to this email directly or view it on GitHub:
https://github.com/xrootd/xrootd/issues/159#issuecomment-62654423
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