LDAP Result Code 200 "Network Error": dial tcp 10.25.0.14:389: connect: no route to host

[AnminSZ]

What is the reason for this error?
Thanks.

[AnminSZ]

func (receiver LdapOauthService) getLdapConn() (*ldap.Conn, error) {
	if ldapConn == nil {
		ldapConnMutex.Lock()
		defer ldapConnMutex.Unlock()
		if ldapConn == nil {
			//l, err := ldap.DialURL(fmt.Sprintf("ldap://%s:%s", GlobalLdapConfig.Host, GlobalLdapConfig.Port))
			l, err := ldap.Dial("tcp", fmt.Sprintf("%s:%s", GlobalLdapConfig.Host, GlobalLdapConfig.Port))
			if err != nil {
				println(err.Error())
				return nil, errors.New("ldap connect error")
			}
			ldapConn = l
		}
	}
	return ldapConn, nil
}