Go to your acct page and setup a password, use that....

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BOINC Wiki

Try
boinc.bakerlab.org/rosetta

It should be working and so is your account because you're posting here.
i.e with your account name & at that url.

Do you require a proxy ?
As it looks like something is blocking the connection. afaik that message also pops up if it cannot communicate. So check also any firewalls on boincmanager.exe and boinc.exe

Maybe a problem with that version as they've very quickly brought out v5.2.12 ?

Changes since 5.2.11
Prompt to retry the connection if a connection failed event occurs.
Treat various forms of the local computer name as a local machine instead of a remote machine.

Changes since 5.2.10
Wizards cannot be run without a connection to the core client.

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Team mauisun.org