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CDR Downloader Service

Running UCM 7.1.5 and have a separate server setup to pull the CDR data out of the CM using the CDR downloader service. Once the CDR service pulls the data we have a FTP/SFTP setup to send the data to another server to process it and generate reports. This process usually works okay, but last week the CDR service started throwing this error below and does not pull any call records from the CM. Sounds like a certificate expired on the CM. I am looking for some insight as to how i can resolve this problem and get the data for the reporting up and running. Attached is the log file generated by the CDR downloader service. Any help is much appreciated.

Caught System.Net.WebException: The underlying connection was closed: Could not establish trust relationship for the SSL/TLS secure channel. ---> System.Security.Authentication.AuthenticationException: The remote certificate is invalid according to the validation procedure.|   at System.Net.Security.SslState.StartSendAuthResetSignal(ProtocolToken message, AsyncProtocolRequest



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