Windows Event Application logs get frequent information level entries, logs may become flooded under certain unclear circumstances, which can hinder work.
In essence the issue should have little to no impact on performance/usability.
Login failed for user 'IIS APPPOOL\Classic .NET AppPool'. Reason: Token-based server access validation failed with an infrastructure error. Check for previous errors. [CLIENT: <local machine>]
Login failed for user 'NT AUTHORITY\ANONYMOUS LOGON'. [CLIENT: <local machine>]
This issue is a minor configurational issue with IIS 7.5. No functionality loss is expected.
Go to Server Manager
Under Roles>Web SErver (IIS)>Internet Information Services (IIS) Manager>(Server Name)>Sites>Default Web Site>Altiris>Task Management
In the Right pane window under Authentication (Double Click icon)
Then enable Anonymous Authentication
The errors in the SQL Logs should go away.
Also some other possible suggestions here:
SMP 7.1.1 ; 7.1.2