I have added a network calendar (served by radicale) to Outlook: screenshot of step one

Now a Windows security message is raised asking for login credentials. Windows screen asking for credentials

However, the domain of the computer is automatically added computername\user, while the server expect to recieve user only.

How can I login without prepending a domain name to the username?


In username field just write a backslash before your username:


You'll see that the domain will remain empty.


Click on more choices. Enter the desired username and password.

  • I do not have this button "more options". I have updated the screenshot above – Vasco May 3 at 11:06

Maybe I misunderstood your problem, but I have to confirm the process you performed:

  1. Add an internet calendar(.ics link) which is served by radicale server to Outlook

enter image description here

  1. Outlook prompted you to enter your account's credential(Windows automatically filled the full UPN(computername\user).)

enter image description here

Right? If some of the above details are different from yours, please provide the related screenshots in your edited post for further troubleshooting(Please alter any sensitive info.).

  • You have rephrased my question correctly. I have added the screenshots to the original question. Do you also have suggestions for an answer? – Vasco Apr 30 at 15:10
  • 1
    This should be a comment. – Gerald Schneider Apr 30 at 15:59
  • 1
    @Vasco Try adding a ".\" in front of the account name and enter the password. For example: User Name: .\Administrator , Password: Password. – Ivan_Wang May 4 at 9:58

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