Site-to-Site VPN stuck at MM_WAIT_MSG4

[NPTsIT]

EDIT: Thanks for the help! I fixed the configuration and all has been fixed.

[RJI · Accepted solution]

Hi,
On FW2 you've configured the crypto map sequence number 11, is this the correct VPN sequence for FW1 peer? If so you've configured "pfs" and "ikev1 phase-mode aggressive" under this crypto-map on FW2 but you don't have the same configured on FW1.

FW1
crypto map outside_map 1 match address outside_cryptomap_2
crypto map outside_map 1 set peer aa.aa.aa.aa
crypto map outside_map 1 set ikev1 transform-set AES-256-SHA
crypto map outside_map interface outside

FW2
crypto map outside_map 11 match address management_cryptomap_2
crypto map outside_map 11 set pfs
crypto map outside_map 11 set peer cc.cc.cc.cc
crypto map outside_map 11 set ikev1 phase1-mode aggressive
crypto map outside_map 11 set ikev1 transform-set AES-256-SHA

These attributes need to match on both Firewalls. I'd recommend not using aggressive-mode at all

HTH

[RJI]

Hi,

My first reply was marked as spam for some reason!

The configuration of the crypto maps are different, you need to make sure they match. I'd recommend removing "ikev1 phase1-mode aggressive" command from the FW2 firewall and add "pfs" to the FW1 configuration.

FW1
crypto map outside_map 1 match address outside_cryptomap_2
crypto map outside_map 1 set peer aa.aa.aa.aa
crypto map outside_map 1 set ikev1 transform-set AES-256-SHA
crypto map outside_map interface outside

FW2
crypto map outside_map 11 match address management_cryptomap_2
crypto map outside_map 11 set pfs
crypto map outside_map 11 set peer cc.cc.cc.cc
crypto map outside_map 11 set ikev1 phase1-mode aggressive
crypto map outside_map 11 set ikev1 transform-set AES-256-SHA

HTH