Check the password in the file gui_rpc_auth.cfg in the BOINC directory, by exiting BOINC and opening the file in a text editor. To make your life easier, remove the password and hit Enter, then save the file. Restart BOINC manager. If it doesn't connect on its own, in the menu bar go to File > Select Computer, type localhost as the host name and leave the password field blank. Click OK.
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Check the password in the file gui_rpc_auth.cfg in the BOINC directory, by exiting BOINC and opening the file in a text editor. To make your life easier, remove the password and hit Enter, then save the file. Restart BOINC manager. If it doesn't connect on its own, in the menu bar go to File > Select Computer, type localhost as the host name and leave the password field blank. Click OK.