Get-SwisObject : An error occurred when verifying security for the message.

I am trying to connect to SolarWinds server from a different server and run a powershell script.  My ultimate goal is mark an IP address as available.  I can get the connection established, but as soon as I do a Get-SwisObject I get a security message.

Get-SwisObject : An error occurred when verifying security for the message.

If I put in a bogas password, I get the same message, so I guess I am not convinced that I am actually getting connected to my solarwinds server.

Here is my script:

If (!(Get-PSSnapin | where {$_.Name -eq "SwisSnapin"})) {
    Add-PSSnapin "SwisSnapin"
}

$hostname = "solar.mycompany.com"
$username="admin"
$password="1234567"

$cred = New-Object -typename System.Management.Automation.PSCredential -argumentlist @($username,(ConvertTo-SecureString -String $password -AsPlainText -Force))

#Connect to the System
$target = Connect-Swis -v2 -Credential $cred -Hostname $hostname

#Get all URIs of Nodes in the System
$UriBasket = Get-SwisData $target "SELECT Uri FROM Orion.Nodes"

I searched high and low and I can not find what this error means (An error occurred when verifying security for the message.).

FYI, I am able to log on with the same account via a web browser, so I know the account has access.

Any help would be greatly appreciated.

Not sure I put this in the right group either.

Thanks, Jon