To configure a preshared key for VPN connections

  1. In the console tree of ISA Server Management, click Virtual Private Networks (VPN).
  2. On the Tasks tab, click Select Authentication Methods.
  3. On the Authentication tab, select Allow custom IPsec policy for L2TP connection if a customer Internet Protocol security (IPsec) policy can be used in a Layer Two Tunneling Protocol (L2TP) VPN connection.
  4. In Pre-shared key, type the preshared key to be used by all connections that use this custom IPsec policy.



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