It seems like your browser didn't download the required fonts. Please revise your security settings and try again.
Barracuda Campus Help Center / Reference

How to Open a Support Tunnel

  • Last updated on

When Barracuda Networks Technical Support needs to troubleshoot and diagnose a potential issue with a Barracuda Networks appliance, the technician uses a support tunnel to remotely connect to that appliance. Go to the ADVANCED > Troubleshooting page in the web interface, and click the Establish Connection to Barracuda Networks Support Center button to create a secure troubleshooting connection from your appliance to the Barracuda Networks Technical Support servers. You should see a screen update similar to Figure 1 below. Note: The support tunnel will remain open even after you close the Troubleshooting window.

Barracuda Networks appliances connect to the Barracuda Networks Support Server located at this address:

  •, 443, 8788 – support tunnel

When opening the support tunnel, the Barracuda Networks appliance attempts to connect directly to the Barracuda Networks Support Server on port 22, 443, or 8788.

Open your network to allow the Barracuda Networks appliance outbound access to ALL on port 22, 443, or 8788. Note that the Barracuda Email Security Gateway sends outbound on these ports and INBOUND traffic is assigned a port by your network's gateway, so outbound traffic on port 443 may come back in on port 23456.

You must have a valid external DNS to resolve support tunnel DNS entries.

Figure 1. Secure Troubleshooting Connection


Important notes:

  1. The Barracuda Networks appliance will attempt to connect to the hostname This is expected.
  2. When opened, the support tunnel remains active for 72 hours.
  3. Closing the popup windows does not close the support tunnel.
  4. To manually close the support tunnel, click the Terminate button in the popup window.

Test Your Network

To test the connection to the support tunnel, complete the following steps:

  1. Go to the ADVANCED > Troubleshooting page and scroll to the Network Connectivity Tests section. In the Telnet Device field, enter: 22, 443, 8788
  2. Click Begin Telnet. You should connect if the port is open.

If you cannot connect to the support tunnel, there is a block on your network that must be resolved.

Customers or networks using an SSL relay (interceptor) will be unable to open a support tunnel. Barracuda Networks verifies the certificate in both directions and if something is intercepting that traffic the connection cannot be made.

For additional troubleshooting options, click Help on the ADVANCED > Troubleshooting page in the web interface.