Are you sure that your Raspi has an internet connection? try to reattach the cable if it is connected through the ethernet cable.
Also, try to replace the pool server or other servers I suggest try this pool below
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https://solo.ckpool.org/I still do not work bring your issue on their official thread here
https://bitcointalk.org/index.php?topic=5053833.0Then ask for help.
Thanks BitMaxz. The pool i guess it's bound with gekko usb minestick. I found similar thread at 2015,
https://forums.raspberrypi.com/viewtopic.php?t=103046&sid=bb1d28d6f7d695a9e9b50de660437d4f#p778336 but no solution, or maybe no one know the answer. And your advised ckpool didn't work either.
Command I used for activate cgminer with GekkoScience Compacf is
sudo ./cgminer -o stratum+tcp://us-east.stratum.slushpool.com:3333 -u [username] -p x --gekko-compacf-freq 400 --suggest-diff 128
Yeah, I used new SD following cgminer installation to raspbian os same result popped. I think the SSH didn't connect or something else. I'll do more searching.
Thanks for helps!