[rt-users] Internet Explorer Error

[der Mouse]

>> Hi, that problem has been solved!!!!  My machine have the name
>> rt_dev.example.com and i change to rtdev.example.com , and it works
>> fine, the problem was the underscore.
> That's not surprising... an underscore is not a valid character in a
> hostname, if I recall the RFC correctly.

This is true in only some contexts.  Email, for example - SMTP does not
permit underscores in domain names appearing in SMTP commands and
responses.  In most other contexts, underscores and miscellaneous other
characters are permitted but discouraged.  See, for example, the first
paragraph of page 5 of RFC 2317.

> I'm surprised your DNS server allowed it.

All 256 octets are legal in DNS labels; any (supposedly)
general-purpose DNS server that doesn't support them is broken.

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