Site to Site VPN connection works fine, programs works fine, can ping but cannot map drives

We have a site to site VPN connection using Netgear FVS318 routers and so far the VPN connection works fine, we can use our programs and the connection stays alive all the time.  I can ping the ip of the remote computer but when I want to browse the folders or map the drive it says "\\ is not accesible. You might not have permission to use this network resource..."  This is when I loggin to the computer using my username@domain.

When I log off and loggin using Adminstrator@computer I CAN browse the folder of the remote computer and I can map the drives.  The ipconfig is the same on both users but only works when I loggin as the Administrator@computer.

I already try to use the "Netbios over TCP/IP" on the advance configurations and didn't help.  I try to add exceptions to the firewall adding the ports 137-139 but still no go.  Please help.
vguzmanIT ManagerAsked:
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This looks more like an issue with the shares and not the router.

Make sure that you are doing a Domain login.

2) Does DNS work - if not make sure that you get this working first so that server names are resolved by name

I hope this helps !
it might be the problem with MTU size issue.
try do ping from any machine at both end.
dos: ping x.x.x.x -f -l  1300

1300 is the value you need to keep changing, find the highest value that ping can be successful.

if you get say, 1350 as max. use a program called "tcp optimizer" and change he mtu size for client pc at remote end to 1350 , and try do file sharing again.

This issue can be resolve using other method, like changing mtu size on your router. but wont mention as things get more complicated.

give it a go, let me know the pign result, so i can assist further
vguzmanIT ManagerAuthor Commented:
Thanks for the help.  I have tried to browse the remote computer by name an by IP like I said but it didn't work.  The DNS is working fine.  Also the MTU is setup at 1430.  I found out that it could be a username credentials problem cause we have different domain names at each location.  I try to use the command:
net use \\remote\sharefolder password /u:domain\username  and it worked !! but now the problem its that I have to do this everytime I log off an login again.  I also tried to add the /persistent:yes at the end but when I reboot (which is not that often) the mapped network drive ask for username and password.  Is there another way how to fix this ?
Thanks again.
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vguzmanIT ManagerAuthor Commented:
its :    net use \\remote\sharefolder password /u:domain\username /persistent:yes
without the </A> like it shows in the previous comment

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you could try the following.

create a username and password on the remote computer which is the same as the username and password you use to log onto your machine it should open up without prompting you for credentials.

make sure the username you created has rights to that share.
vguzmanIT ManagerAuthor Commented:
I already tried that but still not working.  I set up the rights to the share folder, included that usename in the administrator privileges and nothing changed. Could it be cause it's a different domain name ?
Yeah the fact its a different domain name is the problem.
I mentioned on the remote computer create that username and password with the same as the username you are logging onto.  Have you tried to dupicate your username/password on the remote domain Active Directory rather than just on the local computer.  

I guess you could always also just create a batch file with your above code in it and place it on your computers startup folder to auto net use it when you log on?
vguzmanIT ManagerAuthor Commented:
That's what I am doing right now using the net use command but I was looking for a different way on how to do it.  Do you have any other ideas ??
What is wrong with the batch file method you are using?  I wonder if you enabled the guest account.  Gave the folder permission to the guest account you are sharing.

You could try the following

GO to start run -- gpedit.msc -- Windows settings -- Security Settings -- local policies -- security options --
Network Access:  Let everyone permission apply to anonymous users -- set to enable
Network Access:  Shares that can be accessed anonymously - add the share name

Now give everyone rights to the folder you are sharing.

He should now not be prompted for a username and password but anyone can connect to that share even without knowing any credentials.

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