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We implement dot1x on wireless and wired networks. Computers authenticates with Cisco Secure Services Client 4.2.2, User Authentication is Single-Sign-On.
Our Domain Name is "D0"
Sometimes on some computers network is not working when user login with username like "ashihmin_av".
But all is fine when he enters "ASHIHMIN_AV@D0"
We ask users to enter their username with "@D0" suffix
That bug appears randomly on some computers and only on WiFi. On wired dot1x we haven't that problem.