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I am facing an issue while reading emails from my exchange email account using EWS Microsoft API.

Please help me with a solution if anybody has

Used below code

static void Main(string[] args)


            string UserName = "**";

            string Password = "**";

            string EXCHANGEMAILURL = @"<Exchange Webservice URL>";

            ExchangeService service = new ExchangeService();

            service.Timeout = 500000;

            service.Credentials = new NetworkCredential(UserName, Password);

            service.Url = new Uri(EXCHANGEMAILURL);



                ServicePointManager.SecurityProtocol = (SecurityProtocolType)3072;

                ServicePointManager.ServerCertificateValidationCallback += (sender, certificate, chain, sslPolicyErrors) => true;

                FindFoldersResults folderSearchResults = service.FindFolders(WellKnownFolderName.MsgFolderRoot, new FolderView(int.MaxValue));

                Folder xChangeSourceFolder = folderSearchResults.Folders.ToList().Find(

                         f => f.DisplayName.Equals("Inbox", StringComparison.CurrentCultureIgnoreCase));

                ItemView itemView = new ItemView(50);

                FindItemsResults<Item> findIncomingMails = service.FindItems(xChangeSourceFolder.Id, new SearchFilter.IsEqualTo(EmailMessageSchema.IsRead, false),

                     new ItemView(50));

                Item item = findIncomingMails.First();                

                EmailMessage messageHTML = (EmailMessage)item;   

                messageHTML.Load(new PropertySet(BasePropertySet.FirstClassProperties, ItemSchema.Attachments, ItemSchema.Body) { RequestedBodyType = BodyType.HTML });

                string htmlString = messageHTML.Body.Text.ToString();


            catch (Exception ex)


                Console.WriteLine("Exception Occurred : " + ex.StackTrace);



The exception

Unable to connect to the remote server

A connection attempt failed because the connected party did not properly respond after a period of time,or established connection failed because connected host has failed to respond

What I have tried:

It was working before, but since last 1-2 weeks, it stopped working.
Updated 21-Dec-22 3:19am
Richard Deeming 16-Dec-22 8:39am    
That error suggests your client can't talk to your server. Check the server name specified in EXCHANGEMAILURL, and ensure that DNS on the client resolves the host name to the correct IP address.
Ajit Kumar Nayak 16-Dec-22 9:05am    
Yes..EXCHANGEMAILURL is the asmx service we use - and this functionality works on other systems but not on my laptop

I faced same problem all applications used EWS stopped sending emails.Unfortunately, Microsoft stopped Basic authentication on October 1, 2022.

Deprecation of Basic authentication in Exchange Online | Microsoft Learn[^]
Basic Authentication Deprecation in Exchange Online – September 2022 Update - Microsoft Community Hub[^]
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Richard Deeming 22-Dec-22 4:26am    
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