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Unable to send email notifications with Exchange

This article was created in response to a support issue logged with K2. The content may include typographical errors and may be revised at any time without notice. This article is not considered official documentation for K2 software and is provided "as is" with no warranties.
This article has been archived, and/or refers to legacy products, components or features. The content in this article is offered "as is" and will no longer be updated. Archived content is provided for reference purposes only. This content does not infer that the product, component or feature is supported, or that the product, component or feature will continue to function as described herein.


Unable to send email notifications with Exchange. Errors were found on the Window event errors logs as below:



After checking all the connection strings on the ConnectionStringEditor.exe the same error still appeared. The K2 host server file showed the error below:

"7243554","2018-04-25 10:06:08","Error","General","1","GeneralErrorMessage","EwsMessageDestination","1 Could not send message 'ITF001-Account Request(Add)[#102]-Department Head Approval': Microsoft.Exchange.WebServices.Data.ServiceRequestException: The request failed. The remote server returned an error: (407) Proxy Authentication Required. ---> System.Net.WebException: The remote server returned an error: (407) Proxy Authentication Required.
at System.Net.HttpWebRequest.GetResponse()
at Microsoft.Exchange.WebServices.Data.EwsHttpWebRequest.Microsoft.Exchange.WebServices.Data.IEwsHttpWebRequest.GetResponse()
at Microsoft.Exchange.WebServices.Data.ServiceRequestBase.GetEwsHttpWebResponse(IEwsHttpWebRequest request)
--- End of inner exception stack trace ---
at Microsoft.Exchange.WebServices.Data.ServiceRequestBase.GetEwsHttpWebResponse(IEwsHttpWebRequest request)
at Microsoft.Exchange.WebServices.Data.ServiceRequestBase.ValidateAndEmitRequest(IEwsHttpWebRequest& request)
at Microsoft.Exchange.WebServices.Data.MultiResponseServiceRequest`1.Execute()
at Microsoft.Exchange.WebServices.Data.ExchangeService.InternalCreateItems(IEnumerable`1 items, FolderId parentFolderId, Nullable`1 messageDisposition, Nullable`1 sendInvitationsMode, ServiceErrorHandling errorHandling)
at Microsoft.Exchange.WebServices.Data.Item.InternalCreate(FolderId parentFolderId, Nullable`1 messageDisposition, Nullable`1 sendInvitationsMode)
at Microsoft.Exchange.WebServices.Data.EmailMessage.InternalSend(FolderId parentFolderId, MessageDisposition messageDisposition)
at SourceCode.MessageBus.Ews.Destination.EwsMessageDestination.SendMessage(ExchangeService service, String title, MessageExtendedInformation extended, IEnumerable`1 attachments, MessageBodyReader[] messageBodies)
at SourceCode.MessageBus.Ews.Destination.EwsMessageDestination.Send(String title, MessageExtendedInformation extended, IEnumerable`1 attachments, MessageBodyReader[] messageBodies)","anonymous","","BATHL2KS04:D:\Program Files (x86)\K2 blackpearl\Host Server\Bin","7243554","621d1c0939b049198caa13277b47f44f",""

Troubleshooting Steps

To resolve this error, please do the following:

- Made sure the proxy settings are disabled for the K2Service account. 

1. Disable using proxies and retry.

2. Disable the proxy altogether for the K2 service account then retry.

- In Internet Explorer > Tools > Internet Options > Connections > LAN Settings, please make sure that the "Automatically Detect Settings" box is ticked.

- Please verify that the "Bypass Proxy server for local addresses" box is ticked.