So I had an old bminer 14.0 and fork killed it off.
I loaded bminer 15.7.2 and I get rejected shares.
I am remote to these rigs. So 15.7.2 does not work.
[WARN] [2019-07-22T03:57:03+02:00] Rejected share #0 (Unknown)
[INFO] [2019-07-22T03:57:04+02:00] [GPU 0] Speed: 5.93 G/s Fidelity 1.395 Temp: 64C Fan: 61% Power: 106W 0.06 G/J
[INFO] [2019-07-22T03:57:04+02:00] [GPU 1] Speed: 5.49 G/s Fidelity 0.971 Temp: 52C Fan: 61% Power: 117W 0.05 G/J
[INFO] [2019-07-22T03:57:04+02:00] Total 11.42 G/s Accepted shares 0 Rejected shares 21
[WARN] [2019-07-22T03:57:07+02:00] Rejected share #0 (Unknown)
[INFO] [2019-07-22T03:57:08+02:00] Received new job 112296032
[INFO] [2019-07-22T03:57:12+02:00] Received new job 113360992
[WARN] [2019-07-22T03:57:26+02:00] Rejected share #0 (Unknown)
[INFO] [2019-07-22T03:57:29+02:00] Received new job 113361504
[WARN] [2019-07-22T03:57:29+02:00] Rejected share #0 (Unknown)
[WARN] [2019-07-22T03:57:29+02:00] Get error: Too many rejected shares, resetting in 5 seconds
[INFO] [2019-07-22T03:57:34+02:00] [GPU 0] Speed: 5.90 G/s Fidelity 1.293 Temp: 65C Fan: 61% Power: 147W 0.04 G/J
[INFO] [2019-07-22T03:57:34+02:00] [GPU 1] Speed: 5.47 G/s Fidelity 0.861 Temp: 53C Fan: 61% Power: 110W 0.05 G/J
[INFO] [2019-07-22T03:57:34+02:00] Total 11.37 G/s Accepted shares 0 Rejected shares 24
[INFO] [2019-07-22T03:57:34+02:00] Connected to grin29.f2pool.com:13654
[INFO] [2019-07-22T03:57:35+02:00] Authorized with the server
[INFO] [2019-07-22T03:57:35+02:00] Received new job 113360992
If you ever want to go back to bminer 15.7.2, I got the same (rejected shares), but the solution is simple:
make sure that you specified cuckaroo29d instead of cuckaroo29 (note extra "d") in your bminer string.
After that it worked fine (no rejected shares).