some changes

Author: lucciz01

support/power-platform/dataverse/email-exchange-synchronization/test-connection-fails-email-server.md

@@ -1,44 +1,43 @@
 ---
-title: Test Connection fails from Email Server
-description: Provides a solution to an issue where Test Connection fails from Email Server Profile in Microsoft Dynamics 365.
+title: Test Connection fails in email server profile
+description: Provides a solution to an issue where test connection fails from an email server profile in Microsoft Dynamics 365.
 ms.reviewer: 
 ms.date: 12/05/2024
 ms.custom: sap:Email and Exchange Synchronization
 ---
-# Test Connection fails from Email Server Profile in Microsoft Dynamics 365
+# Test Connection fails with 401 or timeout error in email server profile in Microsoft Dynamics 365
 
-This article provides a solution to an issue where Test Connection fails from Email Server Profile in Microsoft Dynamics 365.
+This article provides a solution to an issue where **Test Connection** fails from an email server profile in Microsoft Dynamics 365.
 
 _Applies to:_   Microsoft Dynamics 365  
 _Original KB number:_   4493267
 
 ## Symptoms
 
-When using the Test Connection option from an Email Server Profile in Dynamics 365, the test fails and you may see an error like the following example:
+When you select **Test Connection** on an email server profile record in Dynamics 365, the test fails and you might see one of the following errors:
 
-> "Remote server error: (401) Unauthorized. Make sure the user name and password you entered are correct and try again."
-or
+> Remote server error: (401) Unauthorized. Make sure the user name and password you entered are correct and try again.
 
-> "System.Net.WebException: The operation has timed out
-at System.Net.HttpWebRequest.GetResponse()  
-at Microsoft.Crm.Asynchronous.EmailConnector.ExchangeConnectivityDiscoverer.ValidateServerUrl(EmailDirectionCode emailDirection)"
+Or
 
-## Cause
+> System.Net.WebException: The operation has timed out  
+> at System.Net.HttpWebRequest.GetResponse()  
+> at Microsoft.Crm.Asynchronous.EmailConnector.ExchangeConnectivityDiscoverer.ValidateServerUrl(EmailDirectionCode emailDirection)
 
-- **Cause 1:** The username or password isn't correct.
-- **Cause 2:** If you're using Dynamics 365 (online) to connect to Exchange on-premises, this error can occur if your firewall doesn't allow connectivity from Dynamics 365 to your Exchange server.
-- **Cause 3:** In some cases, the test connection may fail even though the credentials are correct and connectivity isn't a problem. See Resolution 3 in the Resolution section.
+## Cause 1: Incorrect username or password
 
-## Resolution
+To solve this issue, verify the username and password are correct.
 
-- **Resolution 1:** Verify the username and password are correct.
+> [!NOTE]
+> The **User Name** value needs to be in the UPN (User Principal Name) format. For example, use `[email protected]` instead of `contoso\username`.
 
-    > [!NOTE]
-    > The User Name value needs to be in UPN (User Principal Name) format. Ex. `[email protected]` instead of `contoso\username`.
+## Cause 2: Firewall blocking connectivity
 
-- **Resolution 2**: If you're using Dynamics 365 (online) with Exchange on-premises, verify your firewall allows connectivity from the list of IP ranges documented in [Microsoft Dynamics CRM Online IP Address Ranges](https://support.microsoft.com/help/2728473) including the referenced [Azure IP ranges](https://support.microsoft.com/help/2728473).
+If you're using Dynamics 365 (online) with Exchange on-premises, ensure your firewall allows connectivity from the list of IP ranges documented in [Microsoft Dynamics CRM Online IP Address Ranges](https://support.microsoft.com/help/2728473) including the referenced [Azure IP ranges](https://support.microsoft.com/topic/microsoft-dynamics-crm-online-ip-address-ranges-0b22a844-e61d-443b-482f-945de79f764d).
 
-- **Resolution 3:** The Test Connection results aren't always reliable. If the same username and password works when doing a test connection from [Microsoft Remote Connectivity Analyzer](https://testconnectivity.microsoft.com/tests/o365), use the Test & Enable Mailboxes option in Dynamics 365 instead of the Test Connection option. If the Test & Enable is successful for your mailboxes, you can disregard the results from the **Test Connection** dialog.
+## Cause 3: Unreliable test connection results
 
-    > [!NOTE]
-    > If any failures occur using the Test & Enable Mailboxes button, see the **Alerts** tab within the mailbox record and review any help links that are included.
+The test connection results aren't always reliable. If the same username and password works when [testing connection with Microsoft Remote Connectivity Analyzer](/power-platform/admin/test-connection-exchange-server-onpremises#test-connection-with-the-microsoft-remote-connectivity-analyzer), use the **Test & Enable Mailboxes** option in Dynamics 365 instead of the **Test Connection** option. If the **Test & Enable Mailboxes** is successful for your mailboxes, you can disregard the results from the **Test Connection** dialog.
+
+> [!NOTE]
+> If any failures occur using the **Test & Enable Mailboxes** button, see the **Alerts** tab in the mailbox record and review any help links that are included.