Disable messages from SQL Server “Login failed for user” in Event log

I’ve noticed multiple messages from SQL Server in EventLog on my machine
Login failed for user ‘NT AUTHORITYANONYMOUS LOGON’. Reason: Token-based server access validation failed with an infrastructure error. Check for previous errors. [CLIENT: 10.222.25.129]
I’ve found that there are machines of my co-workers, but they were not sure, which processes tried to access my SQL server.

I’ve tried a few things and finally in SQL Server Configuration Manager disabled tcp, as it was suggested in
http://blogs.msdn.com/b/psssql/archive/2010/03/09/what-spn-do-i-use-and-how-does-it-get-there.aspx

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