Mystery solved! Thanks for posting the logs, they definitely helped to see what the issue is. It's very simple: you have -coin etc on your command-line (or bat file), which forces the miner to mine ETC, and this logically leads to 100% incorrect shares when trying to mine ETH. Just remove -coin etc from your bat files (or config.txt if you are using config.txt file) and everything will be back to normal!

For everybody else with 100% incorrect shares problem - check if the miner is reporting Mining ETC on instead of Mining ETH on. If this is the case, find and remove the -coin etc  parameter from your bat file, or config.txt file.


I am a bit confused. In late November with the Thanos Hardfork upgrade this brought the size of the DAG well below 4 gig so that 3 and 4 Gig cards could mine again.  The documentation I read said that we could use phoenix miner and use -coin ETC. I did this and successfully mind for about two months.  Nanopool reflected that I was mining ETH even though I used -coin ETC flag in my config file.  I never really thought about it, but now that I think about it it seems strange I mined ETC see but nanopool was reflecting ETH shares. I was thinking some sort of conversion was taking place behind the scenes.  Starting last Tuesday is when all of my minors hash rates seem normal but Nanopool reflected zero shares being mine. I tried removing the -coin ETC flag with 5.4b as you suggest but my rig show no hashing.  If I leave the -coin ETC flag the rig will hash but nanopool will not reflect this hashing. I did download Phoenixminer 5.4b from github that was running successfully with -coin ETC.  as I remember it with the hardfork we could only mine ETC with 4 Gig cards. Isn’t this true? What changed last Tuesday to make of my rigs stop (Maybe next epoch?) And why when I remove the -coin ETC does my rig stop Hashing? Any information or advice would be appreciated.


UPDATE - i’m an idiot. I just realized I was mining ETC (using Flag coin - ETC) to an ETH Nanopool. For some reason Nanopool allowed this for a couple of months and accepted the shares (they must’ve just been doing some conversion on their side). Nanopool changed something last Tuesday to Start rejecting shares of ETC going to ETH. That’s why I was getting all shares rejected.  I am now mining ETC to Nanopool (https://etc.nanopool.org/account####### also had to change pool address to etc from eth and port from 9999 to 19999). What I don’t know is why I can’t mine ETH using Phoenixminer on EthOS. Seems like an I can only get 5.4c to run on this. I couldn’t figure out how to manually update my Phoenixminer to the latest 5.5c on ethos. I got all the files to the machine but I don’t know how to run the installer on Ethos if it’s possible.

UPDATE 2 I switched everything back to the original in my config file pointing at ETH 9999 and removed -coin ETC flag. It is now working as before last Tuesday. Something in Nanopool changed for 1 week. I’m back to my original configuration running 5.4b with no problem. I did upgrade to 5.5c just for fun and see the same speeds. They are not the original 180 Hash like I was seeing a month ago. I’m down to about 75 hash but I think that’s understood due to increased difficulty.

Thanks
Ken

I am also have this problem. I have six rigs that were all mining since November when 4 gig opened back up and I switched from claymore to Phoenixminer. Although the hashrates have been decreasing over the past month, starting this morning they all skyrocketed back to their maximums I’ve ever seen. About 30 per card. However nanopool shows them all off-line and rejects transactions. I have been using Ethos with Phoenixminer 5.4b. I upgraded 1 machine to 5.4c with the same issue.  I looked at the miner log and it looks like there’s something going on with the Epoch 390. I get the error “not enough vram for dag Epoch 390”. Is this the end of mining ETC with 4 gig cards?

Thanks in advance to anyone who can offer me advice,

Ken