Update mfa-connect-to-exchange-online-powershell.md

Added workaround for one hour time-out problem per Issue #953.

Author: chrisda

exchange/docs-conceptual/exchange-online/connect-to-exchange-online-powershell/mfa-connect-to-exchange-online-powershell.md

@@ -48,8 +48,9 @@ If you want to use multi-factor authentication (MFA) to connect to Exchange Onli
     If basic authentication is disabled, you'll get this error when you try to connect:
 
      `The WinRM client cannot process the request. Basic authentication is currently disabled in the client configuration. Change the client configuration and try the request again.`
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+- When you use the Exchange Online Remote PowerShell Module, your session will end after one hour, which can be problematic for long-running scripts or processes. To avoid this issue, use [Trusted IPs](https://docs.microsoft.com/azure/active-directory/authentication/howto-mfa-mfasettings#trusted-ips) to bypass MFA for connections from your intranet. Also, if you have servers in a datacenter, be sure to add their public IP addresses to Trusted IPs as described [here](https://docs.microsoft.com/azure/active-directory/authentication/howto-mfa-mfasettings#enable-the-trusted-ips-feature-by-using-service-settings).
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 > [!TIP]
 > Having problems? Ask for help in the Exchange forums. Visit the forums at: [Exchange Online](https://go.microsoft.com/fwlink/p/?linkId=267542), or [Exchange Online Protection](https://go.microsoft.com/fwlink/p/?linkId=285351).