browse issues on network

i can UNC to a remote site but I cannot map a drive.   I have 3 sites:   1 corporate and 2 remote sites.   My corporate site cannot browse to my remote sites but each one of my remote sites can browse back to my corporate site.   Neither one of my remote sites can browse to the other remote site.    

At my corporate site, I can ping and UNC to my remote sites but I cannot map a drive.   When I try to do so, I get the no network provider accepted the given network path.  

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0xSaPx0Connect With a Mentor Commented:
There is no reason to run WINS and DNS first off. Secondly make sure all clients are pointed to your DNS Server.

Can you map directly to an IP address "net use z: \\\sharename" ?
What are you using for Name resolution?
drichard16Author Commented:
i have wins server and dns servers in each of my 3 sites.   All 3 sites belong to 1 AD domain.   I have 1 master browser listed in my wins servers.   As I understand it, you can only have 1 master browser per domain.  
drichard16Author Commented:
no, I can not map using the IP address.   So I'm thinking that rules out name resolution issues.   I can ping devices on the other subnets and get resolution.    My only problem is that I cannot map a drive, by name or by IP, to my remote subnets but I can UNC to them by name and IP.   I thought that all this was handeled by netbios tcp and udp ports137 138 and 139.    Again, the way I understand that if I can UNC (\\server\share) then why can't I map a drive.   Isn't it using the same protocols/ports???
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