Hi, @Alok gupta
Thanks for your update.
Please try only recycling the MSExchangeOWAAppPool in IIS.
If it works, you could follow these steps to set a specific time to recycle for MSExchangeOWAAppPool.
Notice: Relying owa app pool will cause user unable to connect to owa. Please select a time of low impact to recycle MSExchangeOWAAppPool.
- Open Internet Information Services (IIS) Manager:
- In the Connections pane, expand the server name, and then click Application Pools.
- In the Application Pools pane, select the MSExchangeOWAAppPool.
- On the Recycling Conditions page of the Edit Application Pool Recycling Settings Wizard. Only select Specific time and set a specific time a time when you want to recycle it.
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