The pool address to which you connect for mining consists of two elements:
These two elements are connected with the colon, like this:
eu.sandbox.pool.ms is domain and
4445 is port.
If you get an error "Missing pool port", this means that when you defined pool, you forgot to add the port to the address.
Your pool tag probably looks something like this:
When it should look like this:
If you don't know which port is correct for your pool, visit the pool's website and search for button "How to connect?". Pools usually list available ports in their instruction manuals.
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