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You are trying to open a VPN tunnel and you are experiencing the following error:

Error VPN083: "No proposal chosen" (Phase 1 Algorithms mismatch).

The message "No proposal chosen" was received during the IKE exchange: The Phase 1 algorithms doesn't match the gateway configuration.

Note: this message may also be received on various values mismatches, thus it is useful you check the whole VPN configuration.

Console message example:

20090429 115905 Default sysdep_app_open: Init Connection for : Cnx-Cnx-P2 Cnx-remote-addr
20090429 115905 Default sysdep_app_open: IPV4_SUBNET Network 192.168.1.1
20090429 115905 Default sysdep_app_open: IPV4_SUBNET Netmask 255.255.255.0
20090429 115911 Default (SA Cnx-P1) SEND phase 1 Main Mode [SA][VID]
20090429 115911 Default RECV Informational [NOTIFY] with NO_PROPOSAL_CHOSEN error

You may:

Check the IPSec VPN Client Phase 1 algorithms to be consistent with the gateway (or peer) Phase 1 algorithms.
Check the IP address range.
Check the Local and remote IDs.
Warning: the local ID on the router is the remote ID on the IPSec VPN Client and conversely !
Check the PFS to be activated or not on both peers (Client and Router).
Restart the router.

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