title: Error in external call of authentication service in Genexus15
body: <p>I am trying to execute a war created in Genexus 15, in a CentOs 7 server with an Apache tomcat 9, the version of jdk is 1.8, I am having an error when I call to an external authentication service of certificates for server and trustore keystore client.
  The error is the folowing:</p>
  <pre><code>java.lang.IllegalArgumentException: object is not an instance of declaring class
  
  
  Fin de Ejecucion servicio sin errores
  MsgRetornoSOAP: NRO: ERROR -10001error decoding server 
  certificate: java.lang.ClassCastException: 
  org.bouncycastle.asn1.DERUnknownTag cannot be cast to 
  org.bouncycastle.asn1.DERString
  Cod retorno
  Mensaje Retorno
  Error GXSOAP
  java.lang.IllegalArgumentException: object is not an 
  instance of declaring class
  gmid: 271431
  </code></pre>
  <p>It seems that is a problem with decodification.</p>