Check your MTU values... ICMP Echo is only sending a 32 byte packet (+ IPSec overhead), so it will naturally be successful. Vista, I'm sure, is sending much bigger packets. To try and find your maximum MTU to set the connection to, you can use a Ping:
ping 192.168.1.1 -l 1500 (if it fails, decrement until it is successful) ping 192.168.1.1 -l 1460 (decrement and continue if it fails...) ping 192.168.1.1 -l 1400 (once successful, adjust your VPN to use the new MTU value) HTH, Aaron T. Rohyans Senior Network Engineer CCIE #21945, CCSP, CCNA, CQS-Firewall, CQS-IPS, CQS-VPN, ISSP, CISP, JNCIA-ER DPSciences Corporation 7400 N. Shadeland Ave., Suite 245 Indianapolis, IN 46250 Office:�� (317) 348-0099 Fa������ (317) 849-7134 [email protected] http://www.dpsciences.com/ -----Original Message----- From: Lee Anderson [mailto:[email protected]] Sent: Tuesday, June 09, 2009 9:47 AM To: NT System Admin Issues Subject: VPN Tunnel not stable in Vista Good Morning All, I am having trouble with a VPN connection in Vista. I am able to negotiate and build out the connection, we can ping across, but as soon as we send any traffic across it is dies. XP machines work fine using same VPN endpoint. I am running Vista Ultimate SP 1 and OpenVPN GUI V1.0.3. I have turned off Vista basic controls such as firewall & IPV6. Downloand 4MB upload 400kb. The connection does not seem to be stable. Please let me know if you have an suggestions or direction. TIA Lee ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~ ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~
