code: protected void closeServerSocket() {
          try {
              this.serverSocket.close();
          } catch (IOException ioe) {
              // no need to do anything except log it and dereference
              if (TraceComponent.isAnyTracingEnabled() && tc.isDebugEnabled()) {
                  Tr.debug(tc, "IOExeption on ServerSocket.close " + ioe.getMessage());
              }
          }
      }
docs: Destroys the server socket associated with this end point.