[rt-users] Auto-logout problem with IE

Tom Lichti tom at redpepperracing.com
Fri Jan 31 22:39:12 EST 2003

I haven't read the RFC, but I believe you. Oddly enough, the DNS server 
(bind 9 I believe) did not bark about the name until we tried to make a 
CNAME entry to the original server name. Then it said it was invalid. We 
removed the one with the underscore and just went with the name without the 

Well, live and learn.


--On Friday, January 31, 2003 11:21 PM +0100 "THAUVIN Blaise (Dir. 
Informatique)" <bthauvin at clearchannel.fr> wrote:

> -----Message d'origine-----
> De : Tom Lichti [mailto:tom at redpepperracing.com]
> Envoye : vendredi 31 janvier 2003 22:42
> A : rt-users at lists.fsck.com
> Objet : Re: [rt-users] Auto-logout problem with IE
>>> I don't know if this is a DNS restriction or a problem with RT, but
> regardless, it's finally fixed.
> It isdefinitely is a restriction in the DNS. The RFCs are very clear about
> it, but Microsoft ignores it and let users put underscores in machines
> names, so now many people think it is authorized. The naming conventions
> in my company used to rely on underscores and we ran into A LOT of strange
> problems like this one. You really want to suppress those. Many software
> running on other OSes will refuse them, namely, Bind, the standard DNS for
> Unix boxes needs to be compiled with a specific setting to accept
> underscores. Most internet DNSes will not carry them.
> Recently, IE started to be more restrictive on underscores in a domain. We
> had a perfectly working commercial application which suddenly would not
> run on some PCs while it was working on some others aparently perfectly
> similar. The only difference was a "security patch" some users had
> downloaded through the automatic windows update system.
> Blaise

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