Interesting, why the timeout 15?
Note, the exe string needs to be single line, no c returns, or line breaks etc.
Also, 2 things you could try on the problem rig.
-mode 1
-dbg 1
I'd try stripping that to the minimum, (also make sure you set your virtual memory to at least 16GB!!!)
setx GPU_FORCE_64BIT_PTR 1
setx GPU_MAX_HEAP_SIZE 100
setx GPU_USE_SYNC_OBJECTS 1
setx GPU_MAX_ALLOC_PERCENT 100
setx GPU_SINGLE_ALLOC_PERCENT 100
EthDcrMiner64.exe -epool eu1.nanopool.org:9999 -ewal wallet.rig/email -epsw x -mode 1
BUT.....I just checked, and it looks like nonopool servers are different to what you have above.
Should be
eth-eu1.nanopool.org
Are you 100% sure, the server you are using is correct?
Cheers
The timeout is just so msi afterburner will spin up the fans before the mining starts. I have the rig on wifi sometimes and it need some more seconds to reconnect to

It was in a single line, just automatic line break in notepad when i copied it. Same on both machines too. Virtual memory was 16gb but after a while it finally said that dag creation failed. I need 29 GB virtual memory to fill DAG on 6x gtx 1070 and 1x gtx 1060 card. I have put 32-40GB virtual memory now instead. The machine was reinstalled to with 10 pro instead of 10 pro n. Shouldn´t do anything i guess.
You are right, the server is wrong but eu1-nanopool.org actually works too

It seems that the problem was solved with virtual memory, i used 5x 1070 before and added two cards today.