C# – System.IO.IOException: The handshake failed due to an unexpected > packet format

Does anyone know what this means?

System.Net.WebException: The
underlying connection was closed: An
unexpected error occurred on a send.
—> System.IO.IOException: The handshake failed due to an unexpected
packet format. at
System.Net.Security.SslState.StartReadFrame(Byte[]
buffer, Int32 readBytes,
AsyncProtocolRequest asyncRequest) at
System.Net.Security.SslState.StartReceiveBlob(Byte[]
buffer, AsyncProtocolRequest
asyncRequest) at
System.Net.Security.SslState.CheckCompletionBeforeNextReceive(ProtocolToken
message, AsyncProtocolRequest
asyncRequest) at
System.Net.Security.SslState.StartSendBlob(Byte[]
incoming, Int32 count,
AsyncProtocolRequest asyncRequest) at
System.Net.Security.SslState.ForceAuthentication(Boolean
receiveFirst, Byte[] buffer,
AsyncProtocolRequest asyncRequest) at
System.Net.Security.SslState.ProcessAuthentication(LazyAsyncResult
lazyResult) at
System.Net.TlsStream.CallProcessAuthentication(Object
state) at
System.Threading.ExecutionContext.runTryCode(Object
userData) at
System.Runtime.CompilerServices.RuntimeHelpers.ExecuteCodeWithGuaranteedCleanup(TryCode
code, CleanupCode backoutCode, Object
userData) at
System.Threading.ExecutionContext.RunInternal(ExecutionContext
executionContext, ContextCallback
callback, Object state) at
System.Threading.ExecutionContext.Run(ExecutionContext
executionContext, ContextCallback
callback, Object state) at
System.Net.TlsStream.ProcessAuthentication(LazyAsyncResult
result) at
System.Net.TlsStream.Write(Byte[]
buffer, Int32 offset, Int32 size) at
System.Net.PooledStream.Write(Byte[]
buffer, Int32 offset, Int32 size) at
System.Net.ConnectStream.WriteHeaders(Boolean
async) — End of inner exception
stack trace — at
System.Net.HttpWebRequest.GetResponse()
at
System.ServiceModel.Channels.HttpChannelFactory.HttpRequestChannel.HttpChannelRequest.WaitForReply(TimeSpan
timeout) at

EDIT:

This is the method I was calling:

_productsService = new ProductsPortTypeClient();
_productsService.GetResortProducts(GetProductsCredentials(),
GetResortProductParams());