Hey guys i'm new and just wanted to share a problem I had in case anyone else who is new runs into the same problem. I was getting dcr job timeout disconnect retry in 20 sec error when trying to dual mine sia and eth and it was because I had the -dcoin on a different line which was causing the error.
I had it like this
EthDcrMiner64.exe -epool eu1.nanopool.org:9999 -ewal YOUR_ETH_WALLET/YOUR_WORKER/YOUR_EMAIL -epsw x -dpool stratum+tcp://sia-eu1.nanopool.org:7777 -dwal YOUR_SIA_WALLET/YOUR_WORKER/YOUR_EMAIL
-dcoin sia