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EWS - The remote server returned an error: (401) Unauthorized

Unanswered EWS - The remote server returned an error: (401) Unauthorized

  • Tuesday, January 22, 2013 7:18 PM
     
     
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    I’m developing client application, which connects to a mailbox then reads/parses messages and updates client database. The company uses Office 365. I’m using Managed APIs :

    var _service = new ExchangeService(ExchangeVersion.Exchange2010_SP1);

                    _service.TraceEnabled = true;

                    _service.Credentials = new System.Net.NetworkCredential("user_id", "user_pwd");

                    AutodiscoverService ads = new AutodiscoverService();

                    ads.EnableScpLookup = false;

                    ads.RedirectionUrlValidationCallback = delegate { return true; };

                    GetUserSettingsResponse grResp = ads.GetUserSettings("user_id@domain_name.com", UserSettingName.InternalEwsUrl);

                    Uri casURI = new Uri(grResp.Settings[UserSettingName.ExternalEwsUrl].ToString());

                    _service.Url = casURI;

    Line starting “ads.GetUserSettings..” gives the error “The remote server returned an error: (401) Unauthorized…” even though I logged as the Exchange Admin...

     

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  • Tuesday, January 22, 2013 11:15 PM
     
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    You need to set the credentials property on your AutodiscoverService object (this is a seperate object from the ExchangeService object) eg

    AutodiscoverService.Credentials = new System.Net.NetworkCredential("user_id","user_pwd");

    You also have another bug in your code your requesting the InternalEWSURL then trying to access the ExternalEwsUrl eg

                    GetUserSettingsResponse grResp = ads.GetUserSettings("user_id@domain_name.com", UserSettingName.InternalEwsUrl);
 
                Uri casURI = new Uri(grResp.Settings[UserSettingName.ExternalEwsUrl].ToString());

Should be

                GetUserSettingsResponse grResp = ads.GetUserSettings("user_id@domain_name.com", UserSettingName.ExternalEwsUrl);
 
                Uri casURI = new Uri(grResp.Settings[UserSettingName.ExternalEwsUrl].ToString());

    Cheers
    Glen