CISCO 2811 router IPSEC(crypto_decrypt_ipsec_sa_check): failed to coalesce

Unanswered Question
Apr 24th, 2008

Scenario:


1.) Workstation from my end sends UDP request to a server through IPSEC tunnel

running between 2 Cisco devices


2.) Packet hits the server and server responds back with a reply.


3.) This reply packet traverses through the VPN device at Location B Client side

(Remote end).


4.) But no traffic seen after decryption on the VPN device at

Location A (local end, my side). We are running a sniffer on the inside interface of

the VPN device.


5.) We suspected some issue on the local VPN router and did an IPSEC

debug. We get the attached output when ever a request is initiated

by the client. This output may be specifying the packets from the server.

It seems like the VPN device at Location A (local end, my end) is unable to decrypt

the packet.


“IPSEC(crypto_decrypt_ipsec_sa_check): failed to coalesce

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