Hi.
I have been running BOINC on some older Intel Mac Minis (2011) for some years now.
After I recently upgraded the Boinc manager to 8.2.8, my projects Asteroids and Einstein are always in Communications deferred mode.
When I try to add other projects, I get the error message Failed to Add Project.
The event log is still reporting Internet access OK but every fetch reports Communications deferred
Any suggestions anyone? Should I revert back to a previous version of BOINC ?
Thank you.

Try to update system certificates.
Here are some advices if your OS is really old: https://apple.stackexchange.com/questions/422332/how-do-i-update-my-root-certificates-on-an-older-version-of-mac-os-e-g-el-capi

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BOINC maintainer.
For any insight, check my BOINC Development Blog.