Forr such issues, please follow the steps below.
1) Check your firewall is off. If Firewall is On, then turn off the firewall.
2) Please check IPV 6 settings, make sure its unchecked.
3) Make sure you are using extenda's updated browser.
4) Always keep your extenda server login as administrator.
5) Check your extenda users added in administrator group.
In case of any issue, please generate the solar ticket.