ERROR: [7559-207-1-00000000]PowerShell Error: PowerShell Result: Connecting to remote server failed (4254473)

Notes Migrator for Exchange (NME) log shows the following:

10:16:58 AdFwd::Init() - PowerShell Result: Connecting to remote server failed with the following error message : The server certificate on the destination computer (pod51030psh.outlook.com:443) has the following errors:
10:16:58 The SSL certificate could not be checked for revocation. The server used to check for revocation might be unreachable.
10:16:58 The SSL certificate is signed by an unknown certificate authority. For more information, see the about_Remote_Troubleshooting Help topic.

Test 1:

Test the Office 365 connection manually by running the cmdlets below and, if required, investigate further with Microsoft Support:

$cred = Get-Credential
$session = New-PSSession -Credential $cred -AllowRedirection -ConnectionUri https://ps.outlook.com/PowerShell -Authentication Basic -ConfigurationName Microsoft.Exchange 
Import-PSSession $session

Test 2:

If Test 1 failes, then test Office 365 connection manually again by adding the "-skiprevocationcheck" option to the "New-PSSession" cmdlet:

$so = New-PSSessionOption –skiprevocationcheck
$cred = Get-Credential
$session = New-PSSession -Credential $cred -AllowRedirection -ConnectionUri https://ps.outlook.com/PowerShell -Authentication Basic -ConfigurationName Microsoft.Exchange -SessionOption $so
Import-PSSession $session

WORKAROUND

If Test 1 fails, but Test 2 allows for a successful PowerShell session with Office 365, then there is some network configuration that is not allowing the NME server to get out to the Internet and check for certificate revocation. Knowledge base article: 107293 discusses how to add a proxy server configuration to Windows Powershell. Another option would be to allow the NME migration server to bypass the proxy server, if that is what is preventing the NME server from checking certificate revocation.

STATUS

An Enhancement Request, TFS 318639, has been logged for this issue and is being considered for a future version of Notes Migrator for Exchange (NME).