Unable to get the server certificate response XML associated with the specified request {Exception: System.ArgumentNullException: Value cannot be null.

Error entry:
Unable to get the server certificate response XML associated with the specified request (Exception: System.ArgumentNullException: Value cannot be null.
Parameter name: certificate
at Altiris.NS.Security.Cryptography.CertificateManager.GetCertificateAsPEM(X509Certificate2 certificate)
at Altiris.Web.NS.Agent.GetServerCertificate.GetLegacyResponse(Boolean getCrlHash, Boolean getCrl)
at Altiris.Web.NS.Agent.GetServerCertificate.GetResponse()
at Altiris.Web.NS.Agent.GetServerCertificate.GetServerCertificateXml())
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Date: 7/27/2018 3:38:34 PM, Tick Count: 13271078 (03:41:11.0780000), Size: 790 B
Process: w3wp (7312), Thread ID: 113, Module: w3wp.exe
Priority: 1, Source: Altiris.Web.NS.Agent.GetServerCertificate.GetServerCertificateXml
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