you need to use your Grant Number as username and password.
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I forgot to add that the latest 5.1 and 6.0 release do not require you to enter any credentials for authentication, so after the installation/upgrade you should be able to access the update server without problems.
Thanks David, I got the grant number from the supplier last week for the vulnerability scanner. I guess it will work for the network security platfrom as this were bought under one umbrella. Thanks.