Error while connecting to powershell using C#

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C#

PowerShell

I'm trying to connect to powershell using C#. But while connectting I'm getting the following error when trying to open the runspace.

"Connecting to remote server failed with the following error message : The WinRM client cannot complete the operation within the time specified. Check if the machine name is valid and is reachable over the network and firewall exception for Windows Remote Management service is enabled."

Below is my code.

What I have tried:

string shellUri = "http://schemas.microsoft.com/powershell/Microsoft.PowerShell";
            PSCredential remoteCredential = new PSCredential("Username", StringToSecureString("Password"));
            WSManConnectionInfo connectionInfo = new WSManConnectionInfo(false, "Server IP", 5985, "/wsman", shellUri, remoteCredential);

            Runspace runspace = RunspaceFactory.CreateRunspace(connectionInfo);

            runspace.Open();

            Pipeline pipeline = runspace.CreatePipeline();

            Command newMailBox = new Command("New-Mailbox");

            newMailBox.Parameters.Add("Name", "TestName1");
            newMailBox.Parameters.Add("Alias", "TestName1");
            newMailBox.Parameters.Add("database", "Mailbox Database 1406738839");
            newMailBox.Parameters.Add("DisplayName", "TestName1");
            newMailBox.Parameters.Add("UserPrincipalName", "TestName1@test.com");
            newMailBox.Parameters.Add("OrganizationalUnit", "ou=myorg,dc=ad,dc=lab");
            newMailBox.Parameters.Add("FirstName", "TestName1");

            pipeline.Commands.Add(newMailBox);

            Collection<psobject> result = pipeline.Invoke();