/**
* Get the LDAP URL to connect to.
*
* @param null|string $server
* @return string[]
* @throws LdapConnectionException
*/
protected function getLdapUrl($server = null)
{
$server = $server ?: $this->serverPool->getServer();
$ldapUrl = ($this->config->getUseSsl() ? 'ldaps' : 'ldap') . '://' . $server . ':' . $this->config->getPort();
return [$ldapUrl, $server];
}