I have configured this OTP Email services in one of my Test lab environment and It was working fine earlier and all of the sudden one day I tried to reset password for one test User I got error: "Unable to send OTP" contact your Admin. I looked into server event log and found below error coming up continuously:
System.Web.Services: System.Net.WebException: The request failed with HTTP status 401: Unauthorized.
at System.Web.Services.Protocols.SoapHttpClientProtocol.ReadResponse(SoapClientMessage message, WebResponse response, Stream responseStream, Boolean asyncCall)
at System.Web.Services.Protocols.SoapHttpClientProtocol.Invoke(String methodName, Object parameters)
at Microsoft.ResourceManagement.WebServices.Mail.Exchange.ExchangeServiceBinding.FindItem(FindItemType FindItem1)
at Microsoft.ResourceManagement.WebServices.Mail.Exchange.MailChannel.ExchangeMailChannelListener`1.ExchangeMailListener.<OnPollTimerExpired>b__0(Boolean findUnreadItems)
at Microsoft.ResourceManagement.WebServices.Mail.Exchange.MailChannel.ExchangeMailChannelListener`1.ExchangeMailListener.OnPollTimerExpired(Object state)
ANDThe Forefront Identity Manager Service cannot connect to the Exchange Web Service.
The connection failure may be due to a network failure, firewall configuration error, or other connection issue. Additionally, the failure may be due to incorrect Exchange Web Service configuration.
Verify that the Exchange Web Service is reachable from the Forefront Identity Manager Service computer. Ensure that Exchange is running, that the network connection is active, and that the firewall is configured properly. Last, ensure that the Exchange Web Service configuration is correct in the Microsoft.ResourceManagement.Service.exe.config file.
Please suggest. Thanks in ad