No Connection to Server

[jwdb78]

Trying to send a fax throug Client 0.6.2 results in following message.
Any ideas would be greatly appreciated

java.net.SocketException: Connection reset
at java.base/java.net.SocketInputStream.read(Unknown Source)
at java.base/java.net.SocketInputStream.read(Unknown Source)
at java.base/sun.nio.cs.StreamDecoder.readBytes(Unknown Source)
at java.base/sun.nio.cs.StreamDecoder.implRead(Unknown Source)
at java.base/sun.nio.cs.StreamDecoder.read(Unknown Source)
at java.base/java.io.InputStreamReader.read(Unknown Source)
at java.base/java.io.BufferedReader.fill(Unknown Source)
at java.base/java.io.BufferedReader.readLine(Unknown Source)
at java.base/java.io.BufferedReader.readLine(Unknown Source)
at gnu.hylafax.HylaFAXClientProtocol.admin(HylaFAXClientProtocol.java:106)
at yajhfc.HylaClientManager.forceLogin(HylaClientManager.java:207)
at yajhfc.model.servconn.hylafax.HylaFaxListConnection.connect(HylaFaxListConnection.java:181)
at yajhfc.MainWin$LoginThread.run(MainWin.java:2988)
at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
at java.base/java.util.concurrent.FutureTask.run(Unknown Source)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.base/java.lang.Thread.run(Unknown Source)

YajHFC 0.6.2
Java 11.0.2 (Oracle Corporation)
OpenJDK Runtime Environment 11.0.2+9
OpenJDK 64-Bit Server VM
Windows 7 6.1 (amd64)