The default port is 4005, which can be changed, but I would advise you not to expose it, not even on a LAN, because it's unencrypted. Better setup a local SSH tunnel to the remote host and have the SLIME client connect through it.
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Hello,
I need to ask my IT department to open ports needed to communicate with SWANK.
What is the port range that SWANK uses?
Or is it possible to specify a port during slime startup?