My desktop PCs and Android tablets had been working fine in the last few weeks, now however I find that they are no longer able to upload finished tasks.

06/03/2017 21:13:01 | rosetta@home | Started upload of UN-NetMotif-Round2_002_CC4_5L8HC4-6_DHR09_002_06.pdb_UN_C4Set1_17_02_16_12_41_globalDocking_7_SAVE_ALL_OUT_470940_32_0_0
06/03/2017 21:13:09 | rosetta@home | Temporarily failed upload of UN-NetMotif-Round2_002_CC4_5L8HC4-6_DHR09_002_06.pdb_UN_C4Set1_17_02_16_12_41_globalDocking_7_SAVE_ALL_OUT_470940_32_0_0: can't resolve hostname
06/03/2017 21:13:09 | rosetta@home | Backing off 03:54:45 on upload of UN-NetMotif-Round2_002_CC4_5L8HC4-6_DHR09_002_06.pdb_UN_C4Set1_17_02_16_12_41_globalDocking_7_SAVE_ALL_OUT_470940_32_0_0
06/03/2017 21:13:31 |  | Project communication failed: attempting access to reference site
06/03/2017 21:13:34 |  | Internet access OK - project servers may be temporarily down.

Actually the https://boinc.bakerlab.org url is not accessible as well... I restarted the tasks, rebooted the PCs, and tried to change DNS servers with no luck.

At least I edited the HOSTS file to manually resolve the IP address of boinc.bakerlab.org.
This hack let me access the Rosetta@home project page and write this post, but the uploads in Boinc manager are still stuck.

Is there anything else I can do to make Boinc manager see the servers?

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Some more info:
- Boinc is the latest available client.
- the desktops are Win10 and Linux machines. They all exhibit this problem.
- Same for the two Android based tablets.
- The ISP is (TIM Telecom Italia). For what's worth they don't have a history of blocking data traffic.
- Seti@home seems to be running fine.

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I know this is an older post but did you check the server status? Maybe the project was actually down at that time.