PhoenixMiner 6.1b:
unkn Eth: Connecting to ethash pool ssl://87.47.83.226:6001 (proto: EthProxy)
2022.04.15:08:00:37.351: eths Eth: Connected to SSL ethash pool 87.47.83.226:6001 (47.57.183.206)
2022.04.15:08:00:38.016: eths Eth: Unable to establish secure connection to ssl://87.47.83.226:6001: tlsv1 alert internal error
2022.04.15:08:00:38.017: eths Eth: Reconnecting in 5 seconds...
Try setting one of the other -proto settings instead off ethproxy.