How to set a port different to the default port on EnsLib.HTTP.OutboundAdapter using HTTPS

We have a webserver which is using a port different to 443 for HTTPS communication. I can connect from the terminal session but not via the EnsLib.HTTP.OutboundAdapter. 

the example used in Terminal:

 
set httprequest=##class(%Net.HttpRequest).%New()
set httprequest.Server="appserver"
set httprequest.Port="4999"
set httprequest.Https=1
set httprequest.SSLConfiguration="app server"
do httprequest.SetHeader("Custom","cust")
set httprequest.ContentType="application/json"
do httprequest.EntityBody.CopyFrom(jsonfile)
do httprequest.Post("/FHIR/Bundle")

And this is my method using the EnsLib.HTTP.OutboundAdapter:

Method PostJSONObjectTemp(pRequest As MyProduction.PostFHIRRESTRequestTemp, pResponse As Ens.Response) As %Status{  Try {    Set httprequest=##class(%Net.HttpRequest).%New()    set httprequest.Server = "appserver"set httprequest.Https = 1    set httprequest.Port = "4999"set httprequest.SSLConfiguration = "app server"    Do httprequest.SetHeader("Custom","cust")    set httprequest.ContentType="application/json"Set httpresponse=##class(%Net.HttpResponse).%New()set status = ..Adapter.SendFormData(httpresponse,"POST",httprequest,"",pRequest.FHIRResourceAsJSON)    //If the adaptor returns an error, throw to catch block    $$$ThrowOnError(tSC)  }  catch ex {    //Return error status. Will be put in Event Log    set tSC = ex.AsStatus()  }return tSC}

In my communication logs I see that always port 443 (Default) is used. How can I change it?