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Problem in establishing IPSec Tunnel

yaminqureshi
Level 1
Level 1

Hello,

I am tring to establish the IPSec VPN Tunnel and getting following error, can anyone have idea about what this error means, I am attaching the error logs, any suggestion are much appreciated.

Thanks in advance.

12 Replies 12

ajagadee
Cisco Employee
Cisco Employee

Is the router behind a firewall or a device that is blocking UDP Port 500 and Protocol 50. Based on the debugs, looks like the router is retransmitting UDP Port 500 packets, make sure that you have the above mentioned ports and protocols open.

Regards,

Arul

timkaye
Level 1
Level 1

Look to remove keep alives between the two end points.

What are the two end points? ASA? router? Pix?

One end is Juniper Netscreen and the remote end is cisco router, these are the logs at the remote end and Cisco router is behind the Firewall.

The Cisco router is behind what type of firewall?

Not sure about that, as other side is not owned by us.

Which parts do you control?

Router part at remote end.

just to be clear.

Your router sits behind a firewall (unknown details) which is trying to establish a VPN to a Juniper?

Juniper is the initiater of the connection and Cisco router is at the receiving end, do you think looking at the logs either udp port500 or protocol50 is blocked by Firewall.

It's worthwhile checking that.

But it appears given the logging it would be open.

Not sure whether you saw this post. Resposting, just in case.

Is the router behind a firewall or a device that is blocking UDP Port 500 and Protocol 50. Based on the debugs, looks like the router is retransmitting UDP Port 500 packets, make sure that you have the above mentioned ports and protocols open.

Regards,

Arul

mohammed.ayubi
Level 1
Level 1

Found this message in the logs :

vendor ID seems Unity/DPD but major 19 mismatch.

Probably you can try disabling the vendor ID and DPD on both the units.

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