SBA is a difficult animal, you do not want to install extra software on it. If you still need to take network trace you can create a following cmd file:
netsh trace start persistent=yes capture=yes maxsize=2048 tracefile=c:\temp\nettrace.etl
netsh trace stop
and run is as administrator
Then open in Microsoft Message Analyser and save as - export as netmon .cap file.
Then you can read it with Wireshark if you want, as you can see it is not possible without Wireshark :)