I had the same problem, there are pools who use port 80 or 8080 for mining.


https://www.f2pool.com/
stratum+tcp://stratum.f2pool.com:80


https://www.litecoinpool.org
stratum+tcp://litecoinpool.org:8080   (London, UK)
stratum+tcp://us.litecoinpool.org:8080   (New York, USA)
stratum+tcp://us2.litecoinpool.org:8080   (San Francisco, USA)
stratum+tcp://ltcpool5brio2gaj.onion:8080   (Tor hidden service)