Am 02.02.2017 um 13:53 schrieb Joe Orton:
Another 2.4.25 regression reported from a Fedora user is that
underscores in hostnames are rejected by default now.  I couldn't see a
specific discussion of this, was it deliberate?

underscores are not allowed in host names by RFC and many things will break at all with them because in different layers of client software things just break by using them

we had that more than once in devel environments where strange bugs turend out to be another case where sombody used a underline in /etc/hosts and his local webserver

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