[Openswan Users] Openswan to Sonicwall - IKE config incorrect

Peter McGill petermcgill at goco.net
Thu Mar 12 09:17:11 EDT 2009

This isn't the problem, it found 3des-sha1-modp1024 just as you 
requested. Those are not error messages, just info messages.
The NO_PROPOSAL_CHOSEN is generally a configuration mismatch.

Check that your settings match those on the Sonicwall.
Is it using 3DES SHA1 Diffie-Hellman (DH) Group 2 (1024 bit)?
Does your Perfect Forward Secrecy (pfs) match? On is best.
Do you ip addresses, id's and subnets match?
Does your Aggressive Mode (aggrmode) match? Off/Main Mode is best.

Peter McGill

Peter Butler wrote:
> Hi There
> I'm trying to connect from Openswan (version 2.4.12) on Ubuntu Intrepid
> (Kernel 2.6.27-11) to a Sonicwall LS2400 and I am getting a
> NO_PROPOSAL_CHOSEN response from Sonicwall. When I run ipsec auto
> --status I get the following as part of the output:
> 000 "home":   IKE algorithms wanted:
> 3DES_CBC(5)_000-SHA1(2)-MODP1024(2); flags=strict
> 000 "home":   IKE algorithms found:
> 3DES_CBC(5)_192-SHA1(2)_160-MODP1024(2)
> 000 "home":   ESP algorithms wanted: 3DES(3)_000-SHA1(2); flags=strict
> 000 "home":   ESP algorithms loaded: 3DES(3)_000-SHA1(2); flags=strict
>>From what I can see Openswan is trying to use a different algorithm for
> IKE from what Sonicwall is expecting. My ipsec.conf contains:
> ike=3des-sha1-modp1024
> What should I be using for this instead? Is there any way to disable
> "strict"? Any help would be greatly appreciated. I can post the output
> of "ipsec barf" if anyone wants to take a closer look.
> Cheers
> Peter
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