return _preferredKeyManager.chooseServerAlias(keyType, issuers, socket);
Iterator<String> it = _managers.keySet().iterator();
while (it.hasNext()) {
String source = it.next();
X509KeyManager km = _managers.get(source);
String alias = km.chooseServerAlias(keyType, issuers, socket);
if (alias != null) return source + SEP + alias;
}
return null;
}