I know it was discussed before, but after reading everything, still no solution.
1. Mining was working fine for months. Windows 10, NVIDIA.
2. One day it stopped. Possibly some windows update was installed. Anyway, the computer was off for a couple of days.
3. Now I get this JSON-RPC problem all the time. 100%
Tried to connect to different pools. All three I tried return the same error. Tried different mining address, same. Tried different versions of ethminer, old, new - same.
Any idea? What else can I check?