@Override
  public String getMessage() {
    StringBuilder sb = new StringBuilder();
    for (InternalDistributedMember member : members) {
      sb.append(' ').append(member);
    }
    sb.append(" ").append("Causes:");
    for (Throwable cause : causes) {
      sb.append(" {").append(cause).append("}");
    }
    return String.format("Could not connect to: %s", sb);
  }
Returns the causes of this exception
geode-core/src/main/java/org/apache/geode/internal/tcp/ConnectExceptions.java