فکر می کنم مسائل زیادی در مورد  vpn  در سيستم هاملهاي مختلف وجود داشته باشد.بسيار خوب ،اين هم يك بانك كامل از مطالب VPN.

VPN Issues

How to setup VPN
VPN Authentication Issues
A connection to the remote computer could not be established
Access denied synchronize offline files via VPN connection
Can ping VPN server but receive System error 53 using net use
Can see the remote computers but get access denied
Can ping the RRAS server but other resources because of Office Scan client
Can't access the Internet after establish Juniper VPN
Can't access MS VPN because of Cisco VPN client
Can't access the remote network at home only
Can't access internet when using VPN
Can't access Linux server over VPN
Can't access outside VPN
Can't access VPN
Can’t access the shared folder of the VPN client
Can't access VPN resources because of two NICs using same IP
Can't connect to a VPN server on the outside of the PIX
Can't browse over VPN
Can't establish VPN via wireless
Can't establish VPN with Error 800
Can't join domain in site to site VPN
Can't join domain over VPN because of using DHCP
Can't map network drives over VPN
Can't ping one of VPN clients
Can't ping external NIC while RRAS is active
Can't remote desktop because router blocks port 3389
Can't see any Network Drives.......
Cannot access remote computers via VPN because of NIS
Cannot access resources after establishing the VPN because of the same IP
Cannot access whole network
Cannot establish the VPN through Netgear RO318
Cannot establish VPN with error 721 and 800
Client VPN IP address must be used as a default gateway
Can XP Home have multi VPN connections open simultaneously, like NT and W2K Pro?
Connecting to vpn disables internet connection on network
Connectivity issue after enabling Windows VPN
Do not install VPN on a system with ICS running
Don't receive assign static Ip after VPN drops/reconnect
Enable Allow Local LAN Access on Cisco VPN client
Error 682, 721 and 800 - Case Study
Error 1060: RASM service does not exist
Error registering your computer
Establishing the VPN only first try
File sharing between domains over site to site VPN
Firewall restricts accessing outside
How to enable RRAS and NAT logs
How  to get VPN client to authenticate on the server with the same credentials that they used to connect to the VPN
How to manage VPN idle time
How to setup VPN for MS VPN clients on Cisco PIX
How to setup split-tunnel on Cisco PIX
How to stop other requests flow through the VPN
I cannot browse local computers through WHS
Internal clients can't access the Internet/network after a remote client connects to RRAS
Issue of save VPN password and IPSec pre-share key
It shows Dial-up connection type rather than a VPN type
Laptop can't VPN while Desktop can - VPN error 721
Local printing via VPN
Logging into AD from remote location?
How to logon locally and remotely
Missing WAN Miniport L2TP and PPTP
Network Filter Drivers Issues in Windows 7
One VPN user disconnects LAN connection
Only able to ping 1 way but no firewall turned on
Problems with WHS Connector
Problems with mapping network drives over a VPN connection
Prompt username when accessing shares over VPN
RDC over VPN disconnects in a several minutes
RDC over VPN problem
Routing & Remote access service was unable was to start
RRAS allow port 25 only
Server 2008 newbie VPN setup question/troubleshooting
Solution for Peer to Peer VPN using the same IP range.
Some routers may take just one VPN connection
The connection to made by user using device was disconnected. 
The option to create a VPN connection unavailable (grayed out)
The remote access server does not accept a PPTP connection
Verizon Air Card: VPN Error Code 720
Fixed: Vista WAN Miniport (SSTP) missing
Vista can't access the WHS
VPN Access not working
VPN and Group Policy
VPN between ASA 5510 and NetVanta 2054 - Case Study
VPN Client can't access remote computer sharing
VPN client can access shared folder with System error 5
VPN client disconnection issues
VPN client can ping all remote computers except one
VPN client cannot ping SBS 2003 server
VPN client can't access one of new server
VPN client access denied when accessing shared folder
VPN connection failed
VPN connection failed 10047
VPN client connection issue after installing 2003 SP1
VPN client lost connectivity
VPN connection appears with a red X
VPN connection is disconnected after several minutes
VPN connection drops after 3 minutes
Vista VPN disappear
VPN disconnects when transferring files
VPN disconnect in one hour and error 800
VPN error 800 on only one computer
VPN Error 721 Collections
VPN Error 709 - can't change the password
VPN Error 800 Collections
VPN always defaults to WAN Miniport (L2TP) instead of PPTP
VPN Logon Problems
VPN network resources issues
VPN speed issue
VPN works on one computer but other one
VPN XP Client Disconnects After One Minute
W2K clients connect but can´t ping VPN server
WSASocket() failed: 10013 when testing GRE
Windows 2003 cannot access remote network using Cisco VPN
Windows 2003 VPN can't browse because routing
Wireless can't access the Internet after establishing VPN
Wireless VPN loses connection


VPN Win98 can access the resources but not W2K/XP