ZEC mining URL includes two types:
1) General Mining URL: if you use general mining URL, Poolin will automatically allocate a mining URL of a node that is most close to your miners.
2) Mining URL of Different Nodes: ZEC now has two mining nodes, including China (Beijing) and USA (Virginia). You can select one mining url that is most close to your miners.
1）General Mining URL：
url1: stratum+tcp://zec.ss.poolin.com:443
url2: stratum+tcp://zec.ss.poolin.com:1883
url3: stratum+tcp://zec.ss.poolin.com:700
2）Mining URL of Different Nodes：
Beijing Node
url1: stratum+tcp://zec-bj.ss.poolin.com:443
url2: stratum+tcp://zec-bj.ss.poolin.com:1883
url3: stratum+tcp://zec-bj.ss.poolin.com:700
Virginia Node
url1: stratum+tcp://zec-va.ss.poolin.com:443
url2: stratum+tcp://zec-va.ss.poolin.com:1883
url3: stratum+tcp://zec-va.ss.poolin.com:700
Note: Mining URL with 443 port is recommended