Let me remind you that you do everything at your own risk.

Because everything is at my own risk I will not be changing any settings and because of this I am still unable to access Gerasim website so unfortunately I will not be able to contribute to project until I am able to access http://gerasim.boinc.ru/

Let me remind you that you do everything at your own risk.

Because everything is at my own risk I will not be changing any settings and because of this I am still unable to access Gerasim website so unfortunately I will not be able to contribute to project until I am able to access http://gerasim.boinc.ru/

No problem.

I'd also like to point out that your server (based on IIS 10) is currently also returning an error:

403 - Forbidden: Access is denied.
You do not have permission to view this directory or page using the credentials that you supplied.

There are at least two possible causes for this:
1. Fingerprint SHA256: c0c2be76f244b8cc67e6cea2ba240452b75e8d4094942c7f5821420155964bb6
Valid until: Thu, 23 Oct 2025 09:12:17 UTC EXPIRED

2. The current domain name has been changed and does not match the name in the certificate.

Your site opens without using SSL.
https://www.spcs.co.nz/ (203.86.194.105)

I hope this helps you or the specialist who helps you resolve these simple issues.

I did further investigation.
If you try to access "gerasim.boinc.ru" for the first time (so use a private window) in the URL it does the certificate prompt. If you cancel instead of selecting a certificate then the website loads fine. Thereafter it always works.

The cross-device certificate is irrelevant since its asking the user to fallback on choosing a cert. The question is why is the prompt happening in the first place?

Here is a video: https://www.dropbox.com/scl/fi/9xeat5awpgemhhwb6dhh3/gerasim-2.mp4?rlkey=4hastrxoul2au54rlfw255j3d&st=d3bu88gm&dl=0

I was able to replicate this on a few windows computers. Whatever self-signed certs are listed in the prompt seem to be irrelevant. It should not be launching this prompt at all.

I did further investigation.
If you try to access "gerasim.boinc.ru" for the first time (so use a private window) in the URL it does the certificate prompt. If you cancel instead of selecting a certificate then the website loads fine. Thereafter it always works.

That's right. That's exactly how it is.

The cross-device certificate is irrelevant since its asking the user to fallback on choosing a cert. The question is why is the prompt happening in the first place?

This question should be asked to the guys from MS, not me.

I showed how to solve this problem in the first part of the post:
https://numberfields.asu.edu/NumberFields/forum_thread.php?id=667&postid=4211
Notice the line:

If the certificate is causing login prompt issues, it is recommended to check if it's being incorrectly used by VPN software rather than Windows, as noted in this Microsoft Q&A post

How to solve this problem?

It is written in the same post, but I will repeat it again:
Press Win + R, type mmc, and press Enter.
Go to File > Add/Remove Snap-in.

Select Certificates > Add > Computer account > Local Computer > Finish.
Navigate to Personal > Certificates.

Select "757dc811-7215-44c9-9856-1101aa2c803c"
(CN = Microsoft Your Phone)

And delete it.
Confirm it.

Restart your browser and check that Gerasim's website has begun to open normally.

Here is a video: https://www.dropbox.com/scl/fi/9xeat5awpgemhhwb6dhh3/gerasim-2.mp4?rlkey=4hastrxoul2au54rlfw255j3d&st=d3bu88gm&dl=0

I watched the video. That's right. The phone certificate interferes.

I was able to replicate this on a few windows computers. Whatever self-signed certs are listed in the prompt seem to be irrelevant. It should not be launching this prompt at all.

Test these recommendations on one of these computers and report the result here.

I am aware about my website & how to access it. I do not see how this has any relevance with the Boinc project in question. Thank you for your concern though