Question : Netbios broadcast not working

I have a home network with a 6 computers all WinXP which are each members of a WORKGROUP. All show up (via netbios name, I assume) when I browse network from any of them, except for one.   That one is on network, pingable, and browsable when the specific address \\computer is used to reference it, but it is otherwise "invisible" to any of the network browsing resources on any machine.  It's name is resolved (for ping command, for instance) by local DNS and it seems to be working fine from all other indications.   File sharing works if drives are mapped using \\computer\share for instance.  But there's no indication that it is on line any other way.  I do notice that right after it's restated, the netbios name shows up in any of the other machines browsers but "disappears" after a few minutes (~15-30) after it comes up.  I've checked to ensure that in the Network Connections Netbios broadcast is enabled so that's not the issue.   I'm at a loss as to how to troubleshoot this annoyance problem.   And, I can't find anything in this forum that seems to cover this situation other than the suggestion to ensure that netbios broadcast is enabled.   Can anyone advise how/what I should check to get this fixed?  Is there a specific service that I should check to ensure that it's enable and that broadcasts the netbios name or ???   Since everything is functional (with exception of being able to see name after the computer is up a while, I'm wondering if there may be some other conflict/collision of services that's hiding the computer's name from other computers).  Thanks in advance for help/suggestions.  (edit - this is all WinXP with latest service packs, etc.  I miscoded the zone to be win98 which this is not relevant to).

Answer : Netbios broadcast not working

Routing and Remote Access is needed for a VPN connection. If this opens a VPN gate to update this DNS dynamically, then I could see RRAS knocking down Netbios. This goes along with what I was saying earlier. RRAS knocks down Netbios because it enables windows firewall.

(( Well Just a theory)).