Forum Discussion How to Troubleshoot EWS Connection Issues Using EWS Editor You get errors when you use any application to connect to (or execute a specific action upon) a mailbox or public folder via the Exchange Web Services (EWS) protocol. To verify if an error is related to application or to your environment, you can use a tool called EWS Editor to connect to the mailbox or public folder that causes errors and check if the error appears. This can be very useful in scenarios when: An application cannot establish connection to a mailbox or upload/download required data An application cannot access public folders An application cannot impersonate a mailbox – Connecting to a mailbox via EWSEditor 1. Go to the https://github.com/dseph/EwsEditor/releases and download the bin package. 2. Copy the downloaded file to the machine where application is installed and extract it. 3. Open the program and click File > New Exchange Service ( Fig. 1. ). Fig. 1. Creating a new EWS connection to a mailbox in EWSEditor. 4. Use the Autodiscover Email option or manually provide the Service URL by using the FQDN of the machine you are connecting to (CAS server). If you use Office 365, click the 365 Default button ( Fig. 2. ). The Service URL for EWS should be as follows: https: machine FQDN>/EWS/Exchange.asmx for example: https://exchange.example.com/EWS/Exchange.asmx Fig. 2. Configuring the EWS connection. 5. Configure the authentication options:

o Direct access: If you want to access your mailbox directly, select Use the following credentials instead of the default Windows credentials and provide the user name and password for that mailbox account ( Fig. 3. ). o Mailbox impersonation: If you want to connect to another mailbox by using the admin’s credentials, click Use the following credentials instead of the default Windows credentials and provide the administrator’s credentials. After that, select the Check if using EWS Impersonation checkbox and provide the primary SMTP address of the mailbox you want to access. Fig. 4. Configuring a connection to a mailbox as an administrator, by using impersonation. 6. When the configuration is complete, click OK . If the connection is successful, you will see a confirmation in the program. If the connection is not successful, the software will throw an error. The appearance of any errors means that the mailbox connection problem is not related to your application and the problem relates to your environment. If you are getting Error 500, then probably your XML configuration file for web services (including EWS) is corrupted. Please consider reverting any recent changes made to that file. Browsing a mailbox Directly after you finish configuring the connection, you get a prompt asking if you want to add the mailbox root to the tree view. Please confirm by clicking Yes ( Fig. 5. ). Fig. 5. The prompt that allows you to browse the mailbox content in EWSEditor. After the addition is complete, you can browse the content of your mailbox under Root\Top of Information Store ( Fig. 6. ). If you are getting any errors while accessing any of the folders within that container, it means that the mailbox is corrupted. Fig. 6. Browsing the content of a mailbox. Browsing public folders To browse public folders of a mailbox account that you added to the EWSEditor’s tree view, right-click the name (email address) of the mailbox at the very top of the tree, and select Add Root Folder . After selecting Identify folder by well known name , choose PublicFoldersRoot ( Fig. 7. ) and click OK . Fig. 7. Adding public folders to the mailbox tree view. If you are getting any errors when accessing public folders, this might mean that public folders are not yet created or their creation is still pending. However, if you are getting trouble accessing some particular public folders, it means that you are missing some of the required permissions. Reference : http://jasparrow.info/2020/08/how-to-troubleshoot-ews-connection-by-using-ews-editor/