Software:
BOINC Manager v7.16.5 (x64)
OS: Windows 7
Involved in: Rosetta@Home and World Community Grid

Hardware:
CPU: GenuineIntel
Intel(R) Core(TM) i5-3470 CPU @ 3.20GHz [Family 6 Model 58 Stepping 9]
(4 processors)
GPU: integrated GPU in CPU

Description of the problem
Today I was can't to transfer a calculated data through a "Transfers tab".
I was thought that reason was an old URL (please see 3-rd string):

1) 31/05/2020 12:32:51 | Rosetta@home | Backing off 03:31:13 on upload of Deep_learning_folding_energy_landscape_wt_frags_mutationsL.6E5C_0001_0001_fragments_abinitio_SAVE_ALL_OUT_940460_1192_0_r1661938331_0
2) 31/05/2020 12:32:52 | | Internet access OK - project servers may be temporarily down.
3) 31/05/2020 12:32:53 | Rosetta@home | This project is using an old URL. When convenient, remove the project, then add https://boinc.bakerlab.org/rosetta/

Current problem:
When I tried to add the project after uninstalling it I was stuck with a new problem (please see 5-th string):

1) 31/05/2020 12:34:10 | Rosetta@home | project suspended by user
2) 31/05/2020 12:34:17 | Rosetta@home | Resetting project
3) 31/05/2020 12:34:32 | Rosetta@home | Detaching from project
4) 31/05/2020 12:35:07 | | Fetching configuration file from https://boinc.bakerlab.org/rosetta/get_project_config.php
5) 31/05/2020 12:35:08 | | Project communication failed: attempting access to reference site
6) 31/05/2020 12:35:09 | | Internet access OK - project servers may be temporarily down.

Sorry for my long message: is Rosetta@home available now for you?
Thank you in advance. Have a good day.

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See the adjacent thread 'Peer certificate cannot be authenticated with given CA certificates'. Rosetta@home is one of the projects where all communications are currently being blocked by an expired security certificate.

There are workrounds in the other thread which will enable you to communicate with Rosetta by editing or replacing a file on your computer. There's also an active discussion on the Rosetta message boards.

Okey. Thank you for the fast response.