When you attempt to connect to a Virtual Private Network (VPN) from
a desktop computer connected to a Handheld PC (H/PC), you receive the
following error message on the desktop computer:
Error 645: Dial-up adapter is in use or is not responding properly.
Disconnect other connections and try again. If this problem persists,
shutdown and restart your computer.
When you attempt to connect an H/PC to a desktop computer connected to
a VPN, you receive the following error message on the H/PC:
Your Connection was dropped because there was no carrier detect signal.
Your Serial cable or serial port hardware may not be communicating this
signal properly. If you are using a modem, your call may have been
dropped or you may need to reset your modem.
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This behavior occurs because Microsoft Dial-Up Networking 1.2 only allows
two active connections. A connection to a VPN uses two Dial-Up Networking
connections: one for the Dial-Up Networking connection itself, and the
other for the connection to the VPN. A Direct Cable Connection to an H/PC
uses a Dial-Up Networking connection.
When you start a connection to a VPN, you cannot start an additional
Dial-Up Networking or Direct Cable Connection. When you start a Direct
Cable Connection, you cannot start a connection to a VPN.
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To prevent this issue from occurring, either disconnect from the VPN
before you connect the H/PC, or disconnect the H/PC before you connect to
the VPN.
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This behavior is by design.
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