Follow these steps:
1-Register on Broadcom Support.
2-Go to the Broadcom Support Online Certificate site.
A certificate dialog opens.
3-Log in with the email and password that you registered with Broadcom Support.
4-Select Save to download your certificate.
Your User Certificate resides on your workstation.
5-Click OK to close the dialog.
6-Note the location of the file on your workstation where the certificate was downloaded.
Error comes on step 3 after specifying user and password "authentication required"