Sophos Central Endpoint and SEC: Computers fail/hang on boot after the Microsoft Windows April 9, 2019 update. Please follow knowledge base article 133945
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I started facing this problem recently. SSO doesnt work for few user, i have to issue a new reserved ip address for the machine then SSO works. I have possibly checked all the configuration in server and in cyberoam couldn't solve the issue.
Could you check on your system events with Event ID 4768 ,if the authentication is successfull . Check the username and relate them with the STAS logs .
You need to provide more information. Are you using STAS or NTLM for authentication.
When you say "doesn't work" what happens?
In reply to Michael Dunn:
Doesn't work in the sense... internet is not provided from SSO they have to specifically login through web client.