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<div class=Section1>
<p class=MsoNormal><span style='font-size:10.0pt'>OK, I have hit a brick wall
here and it’s getting a bit frustrating. I have disabled the Linux
firewall and the Shoreline firewall on my server and I’m still getting
the same error below when I attempt to establish the tunnel. Is this
absolutely positively due to a firewall issue or is it possible that I’ve
got something else incorrectly configured somewhere? I am fairly new to
Linux so I am administering my Ubuntu server with Webmin. That is what I
am using to verify that the firewall(s) are turned off. <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt'>I have also disabled the
firewall on the Linksys box and have examined it’s logs. This is
what shows up after I hit “connect” to initiate the tunnel:<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt'><o:p> </o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt'>Mar
14 09:33:34 - [VPN Log]: "pax_square" #2: initiating Main Mode<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt'>Mar
14 09:33:43 - [VPN Log]: initiate on demand from 192.168.36.100:0 to
192.168.0.30:0 proto=0 state: fos_start because: acquire<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt'>Mar
14 09:34:44 - [VPN Log]: "pax_square" #2: max number of
retransmissions (2) reached STATE_MAIN_I1. No response (or no acceptable
response) to our first IKE message<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt'>Mar
14 10:08:54 - [VPN Log]: "pax_square" #3: initiating Main Mode<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt'>Mar
14 10:10:04 - [VPN Log]: "pax_square" #3: max number of
retransmissions (2) reached STATE_MAIN_I1. No response (or no acceptable
response) to our first IKE message<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt'>Mar
14 10:53:58 - [VPN Log]: "pax_square" #4: initiating Main Mode<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt'>Mar
14 10:55:08 - [VPN Log]: "pax_square" #4: max number of
retransmissions (2) reached STATE_MAIN_I1. No response (or no acceptable
response) to our first IKE message<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt'><o:p> </o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt'>If
it helps, this is my ipsec.conf file on the Ubuntu server running OpenSwan:<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt'><o:p> </o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt'>version 2.0 #
conforms to second version of ipsec.conf specification<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt'><o:p> </o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt'>config
setup<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt'>
interfaces=%defaultroute<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt'>
uniqueids=yes<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt'> <o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt'>include
/etc/ipsec.d/examples/no_oe.conf<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt'> <o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt'>conn
pax_square<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt'>
also=central-site<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt'>
right=%any<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt'>
rightid=@pax_square<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt'>
rightsubnet=192.168.36.0/24<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt'>
also=linksys-policy<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt'>
auto=add <o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt'> <o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt'>conn
central-site<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt'>
left=(external IP of Linux server)<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt'>
leftsubnet=192.168.0.0/24<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt'>
leftsourceip=192.168.0.20<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt'><o:p> </o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt'>conn
linksys-policy<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt'>
ike=3des-md5-modp1024 <o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt'>
esp=3des-md5
<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt'>
compress=no<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt'>
authby=secret </span><span style='font-size:10.0pt;
font-family:"Courier New"'><o:p></o:p></span></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>If it’s definitely the firewall, I’ll go back to
the drawing board and see what I can see.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>As before, I appreciate the help and patience.<o:p></o:p></p>
<p class=MsoNormal>Thanks<o:p></o:p></p>
<p class=MsoNormal>-Chris<o:p></o:p></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<div>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Peter McGill
[mailto:petermcgill@goco.net] <br>
<b>Sent:</b> Thursday, March 13, 2008 4:14 PM<br>
<b>To:</b> Chris Thomas; users@openswan.org<br>
<b>Subject:</b> RE: [Openswan Users] Getting there....<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:blue'>Check your firewall(s) on both ends, and check the linksys logs.</span><span
style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:blue'>You must allow ipsec (and ipsec encapsulated traffic) in your
firewalls.</span><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:blue'>protocol port description</span><span
style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:blue'>17
500 udp:isakmp</span><span style='font-size:12.0pt;
font-family:"Times New Roman","serif"'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:blue'>50 esp</span><span
style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:blue'>You must allow the above inbound and outbound on your internet
interfaces.</span><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:blue'>You must also allow the subnet-to-subnet traffic.</span><span
style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p></span></p>
<div>
<p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'> <o:p></o:p></span></p>
</div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Peter
McGill</span><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p></span></p>
<div>
<p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'> <o:p></o:p></span></p>
</div>
<blockquote style='border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in 4.0pt;
margin-left:3.75pt;margin-top:5.0pt;margin-right:0in;margin-bottom:5.0pt'>
<p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p> </o:p></span></p>
<div class=MsoNormal align=center style='text-align:center'><span
style='font-size:12.0pt;font-family:"Times New Roman","serif"'>
<hr size=2 width="100%" align=center>
</span></div>
<p class=MsoNormal style='margin-bottom:12.0pt'><b><span style='font-size:10.0pt;
font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;
font-family:"Tahoma","sans-serif"'> users-bounces@openswan.org [mailto:users-bounces@openswan.org]
<b>On Behalf Of </b>Chris Thomas<br>
<b>Sent:</b> March 13, 2008 4:06 PM<br>
<b>To:</b> users@openswan.org<br>
<b>Subject:</b> Re: [Openswan Users] Getting there....</span><span
style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p></span></p>
<p class=MsoNormal>OK, I changed my Linksys box to 1024 bit and I now have
this:<o:p></o:p></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Mar
13 16:01:48 gatekeeper pluto[11850]: packet from (remote site IP):500: ignoring
unknown Vendor ID payload [4f4540454371496d7a684644]<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Mar
13 16:01:48 gatekeeper pluto[11850]: packet from (remote site IP):500: received
Vendor ID payload [Dead Peer Detection]<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Mar
13 16:01:48 gatekeeper pluto[11850]: packet from (remote site IP):500: received
Vendor ID payload [RFC 3947] meth=110, but port floating is off<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Mar
13 16:01:48 gatekeeper pluto[11850]: packet from (remote site IP):500: received
Vendor ID payload [draft-ietf-ipsec-nat-t-ike-03] meth=108, but port floating
is off<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Mar
13 16:01:48 gatekeeper pluto[11850]: packet from (remote site IP):500: received
Vendor ID payload [draft-ietf-ipsec-nat-t-ike-02] meth=107, but port floating
is off<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Mar
13 16:01:48 gatekeeper pluto[11850]: packet from (remote site IP):500: ignoring
Vendor ID payload [draft-ietf-ipsec-nat-t-ike-00]<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Mar
13 16:01:48 gatekeeper pluto[11850]: "pax_square"[5] (remote site IP)
#9: responding to Main Mode from unknown peer (remote site IP)<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Mar
13 16:01:48 gatekeeper pluto[11850]: "pax_square"[5] (remote site IP)
#9: transition from state STATE_MAIN_R0 to state STATE_MAIN_R1<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Mar
13 16:01:48 gatekeeper pluto[11850]: "pax_square"[5] (remote site IP)
#9: STATE_MAIN_R1: sent MR1, expecting MI2<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Mar
13 16:02:28 gatekeeper pluto[11850]: "pax_square"[5] (remote site IP)
#7: max number of retransmissions (2) reached STATE_MAIN_R1<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Thanks<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>-Chris<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<div>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Peter McGill
[mailto:petermcgill@goco.net] <br>
<b>Sent:</b> Thursday, March 13, 2008 3:50 PM<br>
<b>To:</b> Chris Thomas; users@openswan.org<br>
<b>Subject:</b> RE: [Openswan Users] Getting there....<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:blue'>There is a mismatch in your options, specifically your DH/modp
Group.</span><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:blue'>Diffie-Hellman (DH) Group needs to match openswan's ike=*-modp????</span><span
style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:blue'>I'm guessing that your linksys is sending Diffie-Hellmen (DH) Group
1 (768-bit).</span><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:blue'>Openswan will not allow this because it's too weak of security.</span><span
style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:blue'>If you have ike=3des-md5-modp1024 or ike=aes-sha1-modp1024 as I
suggested,</span><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:blue'>then change your linksys to use Group 2 (1024-bit) to match it.</span><span
style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p></span></p>
<div>
<p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'> <o:p></o:p></span></p>
</div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Peter
McGill</span><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p></span></p>
<div>
<p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'> <o:p></o:p></span></p>
</div>
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<p class=MsoNormal style='margin-bottom:12.0pt'><b><span style='font-size:10.0pt;
font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;
font-family:"Tahoma","sans-serif"'> users-bounces@openswan.org
[mailto:users-bounces@openswan.org] <b>On Behalf Of </b>Chris Thomas<br>
<b>Sent:</b> March 13, 2008 3:40 PM<br>
<b>To:</b> users@openswan.org<br>
<b>Subject:</b> [Openswan Users] Getting there....</span><span
style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt'>Hello again, everyone.
I have configured my Linksys box to connect to my Ubuntu server running
OpenSwan, but when I attempt to initiate the connection, my logs on the server
at HQ get full of this stuff:<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt'>Mar 13 15:31:54 gatekeeper
pluto[11850]: packet from (remote site external IP):500: ignoring unknown
Vendor ID payload [4f4540454371496d7a684644]<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt'>Mar 13 15:31:54 gatekeeper
pluto[11850]: packet from (remote site external IP):500: received Vendor ID
payload [Dead Peer Detection]<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt'>Mar 13 15:31:54 gatekeeper
pluto[11850]: packet from (remote site external IP):500: received Vendor ID
payload [RFC 3947] meth=110, but port floating is off<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt'>Mar 13 15:31:54 gatekeeper
pluto[11850]: packet from (remote site external IP):500: received Vendor ID
payload [draft-ietf-ipsec-nat-t-ike-03] meth=108, but port floating is off<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt'>Mar 13 15:31:54 gatekeeper
pluto[11850]: packet from (remote site external IP):500: received Vendor ID
payload [draft-ietf-ipsec-nat-t-ike-02] meth=107, but port floating is off<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt'>Mar 13 15:31:54 gatekeeper
pluto[11850]: packet from (remote site external IP):500: ignoring Vendor ID
payload [draft-ietf-ipsec-nat-t-ike-00]<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt'>Mar 13 15:31:54 gatekeeper
pluto[11850]: "pax_square"[1] (remote site external IP) #1:
responding to Main Mode from unknown peer (remote site external IP)<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt'>Mar 13 15:31:54 gatekeeper
pluto[11850]: "pax_square"[1] (remote site external IP) #1: only
OAKLEY_GROUP_MODP1024 and OAKLEY_GROUP_MODP1536 supported. Attribute
OAKLEY_GROUP_DESCRIPTION<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt'>Mar 13 15:31:54 gatekeeper
pluto[11850]: "pax_square"[1] (remote site external IP) #1: no
acceptable Oakley Transform<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt'>Mar 13 15:31:54 gatekeeper
pluto[11850]: "pax_square"[1] (remote site external IP) #1: sending
notification NO_PROPOSAL_CHOSEN to (remote site external IP):500<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt'>Mar 13 15:31:54 gatekeeper
pluto[11850]: "pax_square"[1] (remote site external IP): deleting
connection "pax_square" instance with peer (remote site external IP)
{isakmp=#0/ipsec=#0}<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt'>I am assuming that it has
something to do with the Preshared key that I am using, but I am not too sure
how to go about fixing it. I do not want to be a nuisance, but can anyone
give me a (another) push in the right direction? <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt'>I appreciate your patience.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt'>-Chris</span><o:p></o:p></p>
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