Can't map a drive when using long domain name

I have a Win2k3 domain with a domain name of 19 characters in length (e.g companynamedivGroup).
When I try to map a network drive from an XP machine I cannot do so when using the full 19 characters long domain name. Rather, I need to 'truncate' the name to a 15 characters long domain name (e.g companynamedivG) to be able to map the drive...???
What's going on here?...
Thanks in advance
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Randy_BojanglesConnect With a Mentor Commented:
Windows NT domain names are NETBIOS names - that's what NT used for name resolution

Hence the need for WINS and LMHOSTS files on NT4 networks - these are largely redundant now (though a well placed LMHOSTS file can still solve a few weird issues as MS is not totally reliant on DNS)
Brian PringleSystems Analyst II, SCM, ERPCommented:
By "domain name", do you mean fully qualified domain name or the shorter, Windows NT name?
Brian PringleSystems Analyst II, SCM, ERPCommented:
If you are talking about the "short" domain name, it is limited to 16 bytes (15 characters + 1 reserved byte).  What happens if you use the fully qualified domain name?

Try enclosing the domain name in quotes and see if that works.
The 15 character limit is to do with NETBIOS names:

"When you create a new domain during the Active Directory installation procedure, the system provides a default NetBIOS domain name that matches the leftmost label in the DNS domain name up to the first 15 bytes (NetBIOS names have a limit of 15 bytes). You can change this name during the procedure, but you cannot change it thereafter. When you name a stand-alone server or workstation computer, you provide a computer name that is used as the NetBIOS name and is concatenated with the domain name to form the full computer name"
Brian PringleSystems Analyst II, SCM, ERPCommented:
Yes, but it is also related to shorter, Windows NT domain names.
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