Template:FAQ:Applications 13

One other possibility for the 'sysLocation' and 'sysContact' objects, is that you've got a configuration option in the 'snmpd.conf' file which already sets the corresponding value there.

Earlier versions of the agent would allow you to write to these objects, but the new value would be forgotten the next time the agent was re-started. More recent versions of the agent reject such write requests if there's a value set via the config file. If there isn't such a config setting, then the write request will succeed (assuming the access settings allow it), and the new value will be retained the next time the agent restarts.