Maybe you have enabled "Enable HTTP Authentification", just simply disable it.
On your receiver go to Main menu > Plugin browser > OpenWebif and isable the feature "Enable HTTP Authentification" and press Save
On 80 enter openwebif.
Not entry on port 21 , on por 23.
Firmware router not 21 and 23 , magic its not exist.
Solved , backup config restore on HDD.
Voala magic , Vu + flashed on 8.0 first.
DCC Work well on 2.96 , total access for user.