hi,
I did the same test to change from Dwarfpool to nanopool.
I used the following config:
-wd 1 -r 1 -epool stratum+tcp://eth-eu1.nanopool.org:9999 -ewal 0x.../rig1/myEmailAddress -mode 1 -esm 0 -asm 1 -allpools 1 -mport 127.0.0.1:3333
Rig is starting and sends share to nanopool.
Then log into nanopool and wait a bit until rig appears in the list.
works fine.