Keep getting the SAME ERROR messages across all my PC's:

WUProp@Home 9/30/2021 09:51:30 Scheduler request failed: Peer certificate cannot be authenticated with given CA certificates
WUProp@Home 9/30/2021 09:51:29 [http] HTTP error: Peer certificate cannot be authenticated with given CA certificates
WUProp@Home 9/30/2021 09:51:29 Sending scheduler request: Requested by project.
WUProp@Home 9/30/2021 09:49:11 Scheduler request failed: Peer certificate cannot be authenticated with given CA certificates
WUProp@Home 9/30/2021 09:49:10 [http] HTTP error: Peer certificate cannot be authenticated with given CA certificates
WUProp@Home 9/30/2021 09:49:10 [http] [ID#1] Info: SSL certificate problem: certificate has expired

Other projects are affected too, but only on Windows, while Linux boxes are running fine.
Looks like ca-bundle.crt shipped with windows boinc client is outdated. I fixed this problem by copying /etc/ssl/certs/ca-ceritificates.crt from Linux to C:\Program Files\BOINC\ca-bundle.crt

Btw, this is working ca-bundle.crt (taken from Ubuntu 21.04) https://drive.google.com/file/d/1-zirSeFwap21lRABRLD6k_nlOHlXRLFe/view
(use it only if you trust me, ofc ;))

Replaced the file on windows with one from the link you posted. Problem solved. Read somewhere yesterday about this upcoming issue. Can't find it now.
Thanks
____________

This may be of interest:
https://www.theregister.com/2020/06/10/iot_trouble_root_certificates_expire/

It's possible to fix the issue, without downloading any unknown files from the net.
Edit the file c:\Program Files\BOINC\ca-bundle.crt with administrative privileges, and remove the DST Root CA X3 expired certificate.

DST Root CA X3
==============
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Other projects are affected too, but only on Windows, while Linux boxes are running fine.
Looks like ca-bundle.crt shipped with windows boinc client is outdated. I fixed this problem by copying /etc/ssl/certs/ca-ceritificates.crt from Linux to C:\Program Files\BOINC\ca-bundle.crt

Btw, this is working ca-bundle.crt (taken from Ubuntu 21.04) https://drive.google.com/file/d/1-zirSeFwap21lRABRLD6k_nlOHlXRLFe/view
(use it only if you trust me, ofc ;))

... I fixed this problem by copying /etc/ssl/certs/ca-ceritificates.crt from Linux to C:\Program Files\BOINC\ca-bundle.crt

Btw, this is working ca-bundle.crt (taken from Ubuntu 21.04) https://drive.google.com/file/d/1-zirSeFwap21lRABRLD6k_nlOHlXRLFe/view
(use it only if you trust me, ofc ;))

Works for me as well, thanks.

I'm on Android and having this same error, which means I'm unable to report my completed task - is there any way to fix it there?

I'm on Android and having this same error, which means I'm unable to report my completed task - is there any way to fix it there?

It's possible to fix the issue, without downloading any unknown files from the net.
Edit the file c:\Program Files\BOINC\ca-bundle.crt with administrative privileges, and remove the DST Root CA X3 expired certificate.

I installed the Version 7.18.1 on all androids this morning. But now most wuprop results are marked as not guilty. What is to do?

I installed the Version 7.18.1 on all androids this morning. But now most wuprop results are marked as not guilty. What is to do?

I installed the Version 7.18.1 on all androids this morning. But now most wuprop results are marked as not guilty. What is to do?

08:42:10 (20447): Erreur reception active_result
08:43:10 (20447): can't connect to Unix domain socket

Ok, thx. Will see in a few hours.

I also have this on 1 of my 5 RPIs running Raspian. 4 are identical RPI3s that I setup at the same time, same everything. v7.6.33

Ok, thx. Will see in a few hours.

This is an Expired Certificate issue that does not belong to this or any other projects,

It is a certificate that has expired called IdentTrust DST Root CA X3 that has run from the year 2000 to September 30 2021 and has now expired. Let's Encrypt is the company supplying the certificate.

It deals with HTTPS access to the Web and will stop access if you are using it.
It can't apparently just be extended, and affects most devices prior to 2017. Windows XP Service pack 2 is affected but service pack is not (to a degree), lots of Apple devices and old phones will stop working and can't access the web.

There is a replacement Certificate called ISRG Root X1 and you can get it in a more recent CA Certificate bundle.
Some people have copied the version running in a recent Linux (which does not seem to be affected, probably because Firefox is the only browser that does not rely on the computers certificates to access the net) and then copied that into their Windows machines which seem to have fixed the problem. Or as Den777 posted below by downloading the CA Certificate (what I did) from his posted site.

I updated my CA Certificate bundle and found that only Latin Squares (ODLK1) and ODLK were the only two projects that stopped working.
Even with the updated certificate I had to Remove and Add back each project to get them to work again.

All working again now.

More information is available on the net see Let's Encrypt expiration

Conan
____________

For any 64 Bit Windows users that did not correct their own crt file BOINC Berkeley has released an updated BOINC Version dated 17 Oct 2021. This version contains the corrected file.

7.16.20 can be found here

https://boinc.berkeley.edu/download.php

Bill F
____________
In October 1969 I took an oath to support and defend the Constitution of the United States against all enemies, foreign and domestic;
There was no expiration date.