Prerequisites for an On-Premise Poller to be assigned as a standby for another On-Premise Poller

1. The On-Premise Poller that is being associated as standby On-Premise Poller must not be in a down or suspended state.
   
2. The On-Premise Poller version should be 4.3.0 or above.
   
3. The On-Premise Poller should not have any monitor associated with it.
   
4. The standby On-Premise Poller must be of the same type of OS (Windows or Linux) as that of the primary On-Premise Poller.
5. The standby On-Premise Poller should not have any other On-Premise Poller associated as standby to it.
   
6. The On-Premise Poller should not be associated with another location profile. For example, the On-Premise Poller must not be associated with a location profile that contains global locations or multiple On-Premise Pollers. 

If the On-Premise Poller is associated with other location profiles, you can remove it by navigating to Admin > Configuration Profiles > Location Profile and choose the profile with which the On-Premise Poller is associated and un-check the On-Premise Poller that needs to be assigned as standby.

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