** Troubleshooting ** "The underlying connection was closed: An unexpected error occurred on a receive" when launching Controller client

Troubleshooting

Problem

User launches Controller client. User receives an error.

Symptom

image-20181121073932-1

The underlying connection was closed: An unexpected error occurred on a receive.
   at System.Web.Services.Protocols.WebClientProtocol.GetWebResponse(WebRequest request)
   at System.Web.Services.Protocols.HttpWebClientProtocol.GetWebResponse(WebRequest request)
   at System.Web.Services.Protocols.SoapHttpClientProtocol.Invoke(String methodName, Object[] parameters)
   at Cognos.Controller.ControllerSoapHttpClientProtocol.Invoke(String methodname, Object[] parameters)
   at Cognos.Controller.Proxy.Light.WSLight.CheckServerConnection(String sGuid, String sUser)
   at Cognos.Controller.Direct.ServerInfoD.CheckServerConnection()
   at CCR.AppContext.CheckConnectionToServer()

[{"Business Unit":{"code":"BU048","label":"IBM Software"},"Product":{"code":"SS9S6B","label":"IBM Cognos Controller"},"Component":"","Platform":[{"code":"PF033","label":"Windows"}],"Version":"All Versions","Edition":"","Line of Business":{"code":"LOB76","label":"Data Platform"}},{"Product":{"code":"SSMRTZ","label":"IBM Cognos Controller on Cloud"},"Business Unit":{"code":"BU048","label":"IBM Software"},"Component":" ","Platform":[{"code":"","label":""}],"Version":"","Edition":"","Line of Business":{"code":"LOB76","label":"Data Platform"}}]

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Troubleshooting "The underlying connection was closed: An unexpected error occurred on a receive" when launching Controller client