Site to Site VPN Tunnel

We have configured site to site IPSec VPN tunnel between Netscreen SSG and Nortel 1700. The said tunnel was working fine till last week, post to that we are facing issues of tunnel going down at specified time period and need to disable and enable the SA for VPN tunnel to get it active. This is become routine for the last one week.

Phase 1 : ESP/3DES/MD5 - 86400
Phase 2 : ESP/3des/MD5

We have got the logs from SSG -
IKE<XXX.xXX.XXX.XXX> re-trans timer expired, msg retry (6) (0001/0)
IKE XXX.xXX.XXX.XXX Phase 1: Retransmission limit has been reached

Syslogs from Nortel 1700 :
Nov 18 05:08:45 XXX.XXX.XXX.XXX  7376 11/18/2008 05:02:35 tEvtLgMgr 0 : Security [11] Session: network IPSEC[XXX.XXX.XXX.XXX-255.255.255.255] attempting login

Nov 18 05:08:45 XXX.XXX.XXX.XXX  7376 11/18/2008 05:02:35 tEvtLgMgr 0 : Security [11] Session: network IPSEC[XXX.XXX.XXX.XXX-255.255.255.255] logged in from gateway [XXX.XXX.XXX.XXX]

Nov 18 05:08:45 XXX.XXX.XXX.XXX  7376 11/18/2008 05:02:35 tEvtLgMgr 0 : Security [12] Session: IPSEC[XXX.XXX.XXX.XXX]:28836 physical addresses: remote XXX.XXX.XXX.XXX local XXX.XXX.XXX.XXX

Nov 18 05:08:45 XXX.XXX.XXX.XXX  7376 11/18/2008 05:02:35 tEvtLgMgr 0 : Security [12] Session: IPSEC[-]:29483 physical addresses: remote XXX.XXX.XXX.XXX local XXX.XXX.XXX.XXX

Nov 18 05:09:35 XXX.XXX.XXX.XXX  7376 11/18/2008 05:03:28 tEvtLgMgr 0 : Security [11] Session: IPSEC[XXX.XXX.XXX.XXX] attempting login

Nov 18 05:09:35 XXX.XXX.XXX.XXX  7376 11/18/2008 05:03:28 tEvtLgMgr 0 : Security [11] Session: IPSEC[XXX.XXX.XXX.XXX] attempting login

Nov 18 05:09:35 XXX.XXX.XXX.XXX  7376 11/18/2008 05:03:28 tEvtLgMgr 0 : Security [11] Session: IPSEC[XXX.XXX.XXX.XXX] attempting login

Nov 18 05:09:35 XXX.XXX.XXX.XXX  7376 11/18/2008 05:03:28 tEvtLgMgr 0 : Security [12] Session 912e2c0:  IPSEC[XXX.XXX.XXX.XXX]:28836 sib 0 logged out

Nov 18 05:09:35 XXX.XXX.XXX.XXX  7376 11/18/2008 05:03:28 tEvtLgMgr 0 : Security [11] Session: IPSEC[XXX.XXX.XXX.XXX] attempting login

Nov 18 05:09:35 XXX.XXX.XXX.XXX  7376 11/18/2008 05:03:28 tIsakmp 0 : Failed Login Attempt: Username=XXX.XXX.XXX.XXX: Date/Time=11/18/2008 05:03:28

.Nov 18 05:09:35 XXX.XXX.XXX.XXX  7376 11/18/2008 05:03:28 tIsakmp 0 : Failed Login Attempt: Username=XXX.XXX.XXX.XXX: Date/Time=11/18/2008 05:03:28

.Nov 18 05:09:35 XXX.XXX.XXX.XXX  7376 11/18/2008 05:03:28 tIsakmp 0 : Failed Login Attempt: Username=XXX.XXX.XXX.XXX: Date/Time=11/18/2008 05:03:28

Nov 18 05:10:41 XXX.XXX.XXX.XXX  7376 11/18/2008 05:04:32 tEvtLgMgr 0 : Security [13] Session: IPSEC[XXX.XXX.XXX.XXX]:29484 No response from client - logging out

Nov 18 05:10:41 XXX.XXX.XXX.XXX  7376 11/18/2008 05:04:32 tIsakmp 0 : Failed Login Attempt: Username=XXX.XXX.XXX.XXX: Date/Time=11/18/2008 05:04:32

AnandNallamalaAsked:
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Rick_O_ShayCommented:
It looks like a there is a config mismatch relating to  the key exchange.
I would double check to make sure nothing has been changed on either VPN.
The 1700's config log goes back 60 days so you should be able to track that end pretty easily.
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AnandNallamalaAuthor Commented:
We have solved the problem. Nortel 1700 sending p1 with different set of policies. We have changed SSG p1 with ESP/SHA/3des and the tunnel is back and active.
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Rick_O_ShayCommented:
It sounds like someone did change something in the config.
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AnandNallamalaAuthor Commented:
What we heard from my client is that Nortel1700 doesn't have any P1 config, it accepts other side VPN config. I am not sure on this, I dont have much knowledge in Nortel Contivity. kind wired.
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Rick_O_ShayCommented:
They have the same information in the Nortel 1700 they just don't call it p1.
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AnandNallamalaAuthor Commented:
The problem has been solved. We can close this topic.
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Computer101Commented:
PAQed with points refunded (250)

Computer101
EE Admin
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