Cisco ASA VPN Issue

I'm not an expert in cisco ASA I hope someone can help. I have a vpn connection that was working up until yesterday. I got contacted that there is no connection. I logged into ASDM version 6.3, when i checked under Monitoring\ VPN\Site to Site I did not find that vpn to bounce it. but under configuration \ Site to site VPN the peer Ip info is listed there. what do I need to do to re-establish  connection?

thank you
NANOZAsked:
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NetExpert Network Solutions Pte LtdTechnical SpecialistCommented:
can you run this below command either on the ASA cli mode or thru ADSM CLI command

#sh cry isa sa
NANOZAuthor Commented:
Yes, I ran the command and I see three other peers and the one I need is not one of them. Example:

1      IKE Peer: B.B.B.B      Type    : L2L    Role    : initiator      Rekey   : no      State   : MM_ACTIVE
2         IKE Peer: B.B.B.B      Type    : L2L    Role    : responder      Rekey   : no    State   : MM_ACTIVE
3         IKE Peer: A.A.A.A      Type    : L2L    Role    : responder      Rekey   : no    State   : AM_ACTIVE

The one I need is configured under Site to Site connection profiles though.
cpkuser1Commented:
Do you have access to the other end of the VPN tunnel?

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NANOZAuthor Commented:
Well, no but I got a hold of their IT guy, and after some troubleshooting, we found out that the other end is not allowing isakmp to use UDP port 500.

61: 12:07:25.514896 802.1Q vlan#4 P0 A.A.A.A > B.B.B.B.500:  udp 316
62: 12:07:25.568482 802.1Q vlan#4 P2 B.B.B.B > A.A.A.A: icmp: B.B.B.B udp port 500 unreachable

Issue is resolved, Thank you for your help.
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