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Can't get Synology NAS to open in Win 7

We have a Synology Diskstation RS409 and I have named it fileserver.  On all my XP and Vista computers I can map it by \\fileserver but when I try to do that on a Win 7 computer I am asked for network credentials and even the domain admin login doesn't work.  I can only access it by using the IP address of the NAS. I recently updated the firmware to the latest version too. It doens't seem like a DNS issue but I am not sure.

Thanks
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rindi
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Maybe IPv6 on windows7 is interfering here. Turn that off.
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tzwimfam
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ASKER

I tried that and it didn't work.

Any other suggestions?
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rindi
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tzwimfam
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ASKER

ok that worked.  Can you tell me why that worked?
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rindi
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If you don't have an internal DNS server present inside your LAN that maps hostnames to their IP's and let's the connected PC's know, the hosts file can be used to translate hostnames to their IP's as a cheap "substitute" to a DNS server.
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tzwimfam
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ASKER

we do have a DNS server and it has an entry for the NAS.  I just don't get it why Windows 7 computers can't resolve the location.
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rindi
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Are the PC's all setup to get their IP automatically? What DNS server and DHCP server are you using? Is your DNS server listed in the ipconfig of your Windows 7 PC's? Attach an ipconfig /all of one of your XP and of one of your Windows 7 PC's.
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tzwimfam
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ASKER

Yes.  I use IPCop to assign ip addresses.  IPCop is 120.2 and our DNS server is 120.5 which is a Server 2008 AD virtual machine.  
win7.txt
XP.txt
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rindi
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Why don't you use the 2008 server's built-in DHCP server to manage IP's? It integrates with AD and the DNS Server and would ensure your better functionality in that environment. As far as I know IPCop is a firewall and you don't need to also use it as a DHCP server.

It also looks like the IPCop server is also acting as a DNS server, as it is listed there as well. Make sure only your AD server's DNS servers are advertised by your DHCP server as Name-Servers. No others should be listed, or you can get issues with your AD.