Willkommen hier im Forum!
Was für eine Grafikkarte benutzt für das mining bzw willst du benutzten ?
Dann gleich die nächste frage warum willst du BFG Miner benutzten wenn es da andere miner software gibt die besser ist.
Denke eher das es an der miner software liegt und auch eventuell and der einstellung auf prohashing.
Using the "a" argument is not recommended, and algorithm-specific ports should be used in almost all cases. Because the stratum mining protocol requires commands to be sent before the worker sends its password, commands are sometimes initially sent for the wrong algorithm. Workers that crash on commands that are undefined for their algorithm, instead of ignoring them, will disconnect with the "a=" password argument. However, the port 443 proxy server (stratum+tcp://proxy.prohashing.com:443) is designed to evade firewalls by running on a widely open port, and therefore only one port can be used for the proxy server. The "a=" argument is the only way to specify a worker's algorithm using the proxy server.
If you can connect to an algorithm-specific port, do that to reduce the risk of problems. If you are firewalled behind port 443, then use the "a=" password argument to connect to the proxy mining server.
a=equihash: Mines the most profitable coin for the equihash algorithm, but this worker may fail to start mining because some equihash ASICs crash upon receiving the scrypt-specific commands that must be sent before the password arguments are received by the mining server. Unless the port 443 proxy server is required, using the algorithm-specific port for equihash is recommended.
Source :
https://prohashing.com/help/optimizing-pool-miners#passwordarguments