When troubleshooting networking issues, tcpdump can be a quite useful to help you understand what is going on.
On the Unified Access Gateway, this tool is not available "out-of-the-box". However, it can be easily installed by running a script that is available on the server (when I tested it, I was running UAG version 3.3).
Run the following commands to install it:
cd /etc/vmware/gss-support/
./install.sh
After the installation is complete, you should be able to run tcpdump commands on the server.
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