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Barracuda SSL VPN

Why does the connection time out using a hostname when I connect to the Network Connector on a Barracuda SSL VPN?

  • Type: Knowledgebase
  • Date changed: 6 years ago
Solution #00006082


Scope:

All Barracuda SSL VPN, all firmware versions


Answer: 

When you connect to the Intranet using a Network Connect you are unable to get access with certain targets with their hostsname.

For example if you connect to your file server e.g., \\file_server_name\\public, the connection times out.


Cause: On Windows Vista or higher by default Microsoft  forced us to use IPv6 connections first. When you connect your Intranet to Network Connector clients, the access with their hostnames tries to resolve the IPv6 address.
That's why when you use the Network Connector and try to connect to certain servers with their hostnames, the connection times out.


To avoid this, you can issue a set of commands to increase the priority of IPv4 over IPv6 by adding the following lines in Up Commands on the Network Connector > Client configuration page.


netsh interface ipv6 set prefixpolicy ::ffff:0:0/96 50 0

netsh interface ipv6 set prefixpolicy ::1/128 40 1

netsh interface ipv6 set prefixpolicy ::/0 30 2

netsh interface ipv6 set prefixpolicy 2002::/16 20 3

netsh interface ipv6 set prefixpolicy ::/96 10 4


When you are done using the Network Connetor and if you want to return the settings to default add the following lines in Down Commands.


netsh interface ipv6 set prefixpolicy ::1/128 50 0

netsh interface ipv6 set prefixpolicy ::/0 40 1

netsh interface ipv6 set prefixpolicy 2002::/16 30 2

netsh interface ipv6 set prefixpolicy ::/96 20 3

netsh interface ipv6 set prefixpolicy ::ffff:0:0/96 10 4


Link to This Page: 

https://campus.barracuda.com/solution/50160000000Ixh4AAC