What did you do to get it to work? Mine are showing as dead too. (Unless its AntPool)
Are you sure you have typed everything correctly and also typed a port in the stratum server address?
here is an example (siamining pool)
Pool 1
URL eu.siamining.com:3333
Worker your-siacoin-wallet-address.workername
Password x
Pool 2
URL us-east.siamining.com:3333
Worker your-siacoin-wallet-address.workername
Password x
Pool 3
URL us-west.siamining.com:3333
Worker your-siacoin-wallet-address.workername
Password x
I'm mining just fine at Siamining pool with my A3 unit, no issues what so ever