Symptoms: 1) After establishing a VPN, the VPN client can access the mail
system to receive/send mails but can't access other network resources. 2) When
attempting to access a shared folder, the client may be asked for the username
and password. 3) Some of users may not have this issue.
Cause: This is cached credentials issue, especially you use third party
VPN. For the consultants, refer to case 0304TL.
Assuming you don't have DNS, WINS or other name resolution option to
resolves NetBIOS names, you should use IP to browse the remote computers
after establishing the connection. To do this, you need to find the IPs by
double-clicking the VPN connection icon>Details. This will give you the
"virtual" IP allocated to both machines. Then use net use command to map the
remote computer. If you get access denied error, try to add /user:username
option to cache credentials.
Symptoms: 1. If the WINS server is on the same
computer as the PPTP/VPN server, and you attempt to connect to a computer
using a PPTP/VPN client, you may experience following problem: 1) The NetBIOS
name of the computer to which you are attempting to connect is not resolved.
2) You may receive an error message similar to the following error message:
"System error 53 has occurred. The network path was not found" when using
net view or opening Network Knighthood.
2. If the WINS server is not on the same computer as the PPTP server and you
attempt to connect to a computer using a PPTP client, you may be able to
connect to computers on your local area network (LAN), but you may be unable
to connect to network shares or resources on the PPTP server.
Inability to browse
often means the client can't resolve NetBIOS names.
1. If this is a workgroup network, enable NetBIOS over TCP/IP on the server
2. If this is domain network and the WINS server is on the same computer as
the PPTP/VPN server, move the WINS server to a different computer.
3. Add the NetBEUI protocol for your PPTP tunnel instead of, or in addition
4. By default, most routers and firewalls prevent the
transmission of NetBIOS names unless you enable UDP ports 137 and 138 and TCP
port 139. Try to enable UDP ports 137 and 138 and TCP port 139 across
all routers and firewalls between the PPTP/VPN client and PPTP/VPN server.
5. Make sure the client has correct DNS, WINS and
Master Browser settings.
6. Make sure the default gateway points to the remote network rather than to
7. Some ISP might block ports required for NetBIOS name broadcasts.
8. If WINS address is not distributed upon connection to VPN, LMHOSTS
should be configured to enable Domain to be located.
9. If you try these techniques and the client still can't browse, try to use
UNC to connect to the remote resources by ip, for example, use the net use h: