1.
What are you Mining4?
Select DASH on the left under "coins" for connection details,
US based stratum use URL: stratum+tcp://us-dash.mining4.co.uk, same ports.
"3338" for CPU or single GPU, "3339" for Multi-GPU, "3340" for nicehash and asic

Equihash Multi pool

Multicoin pool for BitcoinZ, Hush, Komodo, Zcash, Zencash, Zclassic. PROP 0.25% fee

Mining4 Dash Pool

Dash X11 pool, PROP 0.25% fee. NEW!

Mining4 Bitcoin Gold

Bitcoin gold pool using the equihash algorithm, PPLNTS 0.25% fee. NEW!