3 miner only 2 working。why？

i have three miner rig ,two is dr100 and one d3
now,have one dr100 dont regular work,But there's no problem in other mineral pools.
I am using the following details to try and connect:
1 dr100：
URL - stratum+tcp://prohashing.com:3333
Worker - loginid.1
Password -a=x11

its ok！

2 dr100
URL - stratum+tcp://prohashing.com:3333
Worker - loginid.2
Password -a=x11

its dead！dont connect

why，pls help me ，thanks！

make your worker/user name the same as working unit #1

and add n=wkr1 to password line for #1 and n=wkr2 to password line for #2 that should fix you up.

also remove the dash from a in the password.

password: a=x11 n=miner1

password for machine2: a=x11 n=miner2