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9.0

Site to Site VPN tunnel issues

Asked by cgillet in Virtual Private Networking (VPN), Networking Hardware Firewalls, IPSec Security Protocol

Tags: VPN, Firewall

Scenario: 2 sites 1 Domain
Main office:
Watchguard Firebox X Edge
MS Small Business Server 2003 w/ Exchange
30-40 windows XP professional clients
T1
192.168.2.x subnet

Remote office:
Fortigate 60
10-20 windows XP professional clients
DSL
192.168.3.x subnet

There is a site-to-site VPN setup between the two firewall devices. Remote office workers access shared folders and e-mail over the VPN tunnel. VPN tunnel has been shutting down every couple weeks. I've been able to solve this by logging into each VPN device and refreshing the IPsec keys and/or resetting the remote office firewall. Once the tunnel is active connectivity returns to normal. The settings are DH5, Sha-1, 3DES-CBC pre-shared key. key exprires every 24 hours.

Any ideas why the tunnel would break intermittently? Today was the most recent occurence of this event and I've been able to get the tunnel backup with a reboot on the Fortigate60 at the remote site. But now remote office clients cannot access shared files or network drives. Tunnel status is showing as active on both devices

Also the Watchguard at the main site will intermittently freeze every few weeks, requiring a reboot. There's no common interval. Sometimes it will be up for 6 weeks some times 4 or 5 days.
I've heard that malware can cause buffer overflows and wierd gateway problems. I've been logging events on the watchguard to verify my suspician but haven't seen anything conclusive yet.
 
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Keywords: Site to Site VPN tunnel issues
Title
1 VPN Firewall Recommendations
 
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[+][-]10/19/09 06:19 PM, ID: 25610347Accepted Solution

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Zones: Virtual Private Networking (VPN), Networking Hardware Firewalls, IPSec Security Protocol
Tags: VPN, Firewall
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Solution Provided By: bignewf
Participating Experts: 2
Solution Grade: A
 
[+][-]10/19/09 01:45 PM, ID: 25608849Assisted Solution

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