vpn connection issue with iPass Cisco VPN client

Unanswered Question

Hi All,

We are facing one issue for connecting to remote end Cisco VPN concentrator using VPN client. Remote end is VPN concentrator is not managed by us.User is using iPass 3.51 and Cisco VPN Client 4.8.02.Users are using our internet connection for this vpn & behind Checkpoint FW.

Remote end VPN concentrator is configured to accept vpn connection on customized port of TCP 9009 & same has been open on our firewall.Now issue is that users are not able to connect using VPN client while connected in our n/w but at the same time users are able to telnet remote end vpn conc.ip on mentioned port i.e.9009 but using vpn client they can't connect.Our firewall has been open for UDP IKE,IKE NAT-T,TCp IKE,TCP 9009 ports.But this connection is only using TCP 9009 for connection.Now strange thing is that if they disconnect from our n/w & use their 3G connection it works fine. We have collected logs from VPN client attached herewith. Remote end guys also checked logs on concentrator & suspecting asymetrical routing issue but our n/w team has confirmed that this is not the case.

User is getting error like "Reason 412 connection terminated by vpn client locally;remote peer no longer responding"

Can anybody please help if we can diagnose the problem here using these logs as we only have these logs for troubleshooting ? Your help is much appreciated.

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bwilmoth Thu, 01/22/2009 - 06:35

The description for the error is "The remote peer is not responding to the client's request to establish the connection. Make sure you can ping the remote peer, or check remote peer logs for why it is not responding to the client." Check whether any traffic block from the remote peer or check the verison f VPN concentrator because the Cisco VPN Client supports Cisco VPN 3000 Concentrator Software Version 3.0 and later.

cisco24x7 Thu, 01/22/2009 - 08:37

Here are some suggestions:

1- what is the checkpoint version on your end?

"fw ver" "uname -a" will display that.

2- If I have to guess, I would say Checkpoint

SmartDefense (SDF) causes this issue. Can

you disable SDF profile, if you are running

NGx R65?

3- run "fw monitor" and capture the file. You

then use wireshark to find out why it is not


Let me know if you need additional help.

Hi cisco24x7,

1.I have Checkpoint NGX R65(Smart Center Server) with Nokia IP530 (enforcement module) on NG AI R55 HFA_19 Hotfix-848 Build-018 & IPSO ver 3.7

2.I can't see any drop on firewall via smartdefense.Also we have only default protection for smatdefense like icmp,ping sweep etc.

3.Unfortunately I couldn't run "fw monitor" when user was trying but captured tcpdump from nokia box.Here is a small part of tcpdump o/p

12:27:13.413126 I > x.x.64.100.9009: S 16810110:16810110(0) win 65535

12:27:13.453848 O x.x.64.100.9009 > S 3871196192:3871196192(0) ack 16810111 win 65535 [tos 0x20]

12:27:13.459023 I > x.x.64.100.9009: . ack 1 win 32767

12:27:14.164689 I > x.x.64.100.9009: . 1:537(536) ack 1 win 32767

12:27:14.164708 I > x.x.64.100.9009: P 537:652(115) ack 1 win 32767

12:27:17.165341 I > x.x.64.100.9009: . 1:537(536) ack 1 win 32767

12:27:20.138821 I > z.z.150.97.9009: S 16810117:16810117(0) win 65535

12:27:20.143505 I > x.x.64.100.9009: R 652:652(0) ack 1 win 32767

12:27:20.144710 I > x.x.64.100.9009: . ack 2147483719 win 46

12:27:20.150926 I > x.x.64.100.9009: R 2147484164:2147484164(0) ack 2147483719 win 46

Sorry for pasting such large & Checkpoint related post in Cisco forum....


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