"Some Nvidia cards will report a lot of stale shares under Windows 11. Using the same driver version under Windows 10 resolves the issue."

What does this mean? Have to revert back to Win 10?

Thanks for the suggestion although marking the checkbox didn't help and I already had the folder white listed.
I did finally get it to run, not with the config file but with a this simple bat file:
ssl://us1.ethermine.org:5555 -wal MyEthWalletAddress.Eve -proto 3

Perhaps it isn't a firewall or anti-virus problem but instead an issue with my admin access; something I need to do on a brand new computer.

ABS Legend Gaming PC - Intel i9 10850K - EVGA GeForce RTX 3090 FTW3 Ultra Gaming - G.Skill TridentZ RGB 32GB DDR4
Getting 107 Mh/s @ 419W out of the box without tweaking it yet.

No, I have a config file. I'm right clicking the file and selecting "run as administrator".

Same config file I run on my other machines except I edited a new miner name:

-pool ssl://us2.ethermine.org:5555
-wal xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx.Eve 
-proto 3
-prate 0.16
-astats 1
-straps 2
-hstats 2
-retrydelay 300
-nvmem 2

I have a brand new computer just out of the box, with Windows 10 Home. The security is stopping me from running PhoenixMiner. This is so frustrating.

I had to disable "real-time" protection just to download and unzip the file without it being deleted.

I added Virus & Threat Protection exclusions for both the folder I'm running it from, and for the PhoenixMiner.exe file.

I've added PhonenixMiner to "Allow app through firewall" and it is showing in my list of Allowed apps and features.

I've tried turning off "Virus and Threat Protection" and "Firewall & Network Protection" completely.

When I try to run PhonenixMiner as an Admin, I get the usual warning "Do you want to allow this app from an unknown publisher to make changes to your device?" I answer "Yes" and then nothing, no window opens, no error message.  I can't find anything in the system logs. The graphics card shows in the Device Manager.

I have PhoenixMiner running on 7 other machines and so I'm not new to this, I can't see any difference between the machines except on this new one I'm trying to run 5.6d, and it is Win10 Home instead of Pro.

What am I missing?

In the first post of this thread there is information about the DAG size and the decrease of hash rate for 4GB cards. Everyone is probably surprised that you're still trying to use 4GB cards. Although you may not want to hear it but the resolution to your problem is to upgrade at a card with a minimum of 6GB. As the DAG file increases each epoch, the hash rate is going to continue to decline.

Where do I see the "specific hashrate" in joules? I've switched to 5.6a and I'm still seeing hashrate in MH/s on the screen and in the logs:

021.04.19:00:00:28.465: main GPUs: 1: 43.268 MH/s (6) 2: 44.619 MH/s (10)
2021.04.19:00:00:31.256: eths Eth: Received: {"id":0,"jsonrpc":"2.0","result":["0xc9a80c719e3f4d8406228507678e6daad93f5dcf54c58c9d94547078b6b1f663","0xba5586fb4d9d316d3a8d5834d9b1a48f50d7c428281b93d90be12d67409c59af","0x0000000112e0be826d694b2e62d01511f12a6061fbaec8bc02357593e70e52ba","0xbb33e5"]}
2021.04.19:00:00:31.256: eths Eth: New job #c9a80c71 from ssl://us2.ethermine.org:5555; diff: 4000MH
2021.04.19:00:00:33.237: main 
2021.04.19:00:00:33.237: main *** 0:15 *** 4/19 00:00 **************************************
2021.04.19:00:00:33.237: main Eth: Mining ETH on ssl://us2.ethermine.org:5555 for 0:15
2021.04.19:00:00:33.237: main Eth: Accepted shares 16 (0 stales), rejected shares 0 (0 stales)
2021.04.19:00:00:33.237: main Eth: Incorrect shares 0 (0.00%), est. stales percentage 0.00%
2021.04.19:00:00:33.237: main Eth: Maximum difficulty of found share: 105.2 GH (!)
2021.04.19:00:00:33.237: main Eth: Average speed (5 min): 87.919 MH/s
2021.04.19:00:00:33.237: main Eth: Effective speed: 67.51 MH/s; at pool: 67.51 MH/s
2021.04.19:00:00:33.237: main Eth: Estimated income: 8.88 USD/day

I'm at 460.89, although I think Phoenix Miner does work with the latest NVIDIA drivers.  All rejected shares might not be a driver problem.  Check your bat file or config.txt to make certain you aren't trying to mine ETC on an ETH mining pool.

What driver are you using? I had this problem and after using DDU then installing studio driver instead of game ready driver resolved the issue for me. From reading this forum I've seen suggestions to add -eres 0 to the config file to resolve out of memory issues. You should try that before going through the trouble of installing studio drivers.

Is the installed driver showing in your device manager?  I had the "No available GPUs for mining error" recently when trying to install a new RTX 3090. I couldn't get the driver installed after DDU, and trying to install with GeForce experience or with the stand alone driver. The resolution was to update my version of Windows 10 Pro to the latest version, then the driver installed and the "no GPU" error was resolved.

On a couple of my workers the "prate" parameter has stopped working. The problem started after I subscribed to minerstat. I've since uninstalled minerstat, upgraded Phoenix versions a couple of time (now at 5.5c), deleted Phoenix and re-installed. I can't figure out why prate isn't showing me the electricity cost anymore. On the workers where prate does work the batch file looks the same.

I'm using a config file so I can run the miner as admin.

config.txt:

-pool ssl://asia1.ethermine.org:5555
-wal [Address].Julian   
-proto 3
-prate 0.116
-astats 1
-straps 2

The screen and the log show the temperature information but the usual line right after it with the power cost is omitted.

2021.02.08:22:34:23.798: main GPU1: 67C 44%, GPU2: 73C 61%
2021.02.08:22:34:24.619: main Eth speed: 88.654 MH/s, shares: 12/0/0, time: 0:15
2021.02.08:22:34:24.619: main GPUs: 1: 46.246 MH/s (4) 2: 42.408 MH/s (
2021.02.08:22:34:25.800: eths Eth: Send: {"id":5,"jsonrpc":"2.0","method":"eth_getWork","params":[]}