Exchange Server 2013 Troubleshooting: Unable to access Resource Mailbox using ECP Encounter “500 Unexpected Error”

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Issue:

Unable to access Resource Mailbox using ECP. Encounter “500 Unexpected Error”

Symptom:

Accessing the resource tab under settings of resource mailbox gives errors

Log Name:  Application

Source:  MSExchange Control Panel

Date:  12/22/2016 3:45:20 PM

Event ID:  5

Task Category: General

Level:  Error

Keywords:  Classic

User:  N/A

Computer:  cas.contoso.com

Description:

Current user: '"contoso.com/Accounts/user1" on behalf of "contoso.com/Accounts/Generic/ConferenceRoom"'

Web service call 'https:// cas.contoso.com:444/ecp/DDI/DDIService.svc/GetList?schema=MobileDeviceService&msExchEcpCanary=BpaxpOQmuEm9OmaRC7FIOj-WkVp8INQIZ5ipGsuiueENwI5OBPLT0_OtO4gfDD1N1SG3ksZ6WEE.(https://localhost/ecp/conferenceroom@contoso.com/DDI/DDIService.svc/GetList?schema=MobileDeviceService&msExchEcpCanary=BpaxpOQmuEm9OmaRC7FIOj-WkVp8INQIZ5ipGsuiueENwI5OBPLT0_OtO4gfDD1N1SG3ksZ6WEE.)' failed with the following error:

Microsoft.Exchange.Configuration.Authorization.CmdletAccessDeniedException: You don't have permission to open this page. If you're a new user or were recently assigned credentials, please wait 15 minutes and try again.

Cause:

 Stale entries of disconnected mailbox causing invalid search filter.

Resolution:

  1.  Take backup of calendar permissions : get-calendarprocessing conferenceroom |fl >c:\temp\backup.txt
  2.  Remove the accounts under bookinpolicy,reuqestinpolicy and requestoutofpolicy. Probably one of the fields has corrupted account entry.
    1. Set-calendarprocessing conferenceroom -BookInPolicy $null -RequestInPolicy $null – RequestOutOfPolicy $null
  3. Validate if you can access the conference room without the error
  4. Provide the permissions under bookinpolicy,RequestInPolicy and RequestOutOfPolicy to conferenceroom from backup.txt

References:

https://technet.microsoft.com/en-us/library/dd335046(v=exchg.150).aspx