Solved Linksys Router BEFSR81

[neb]

I have a Linksys Router BEFSR81 firmware version 2.51.0

I would like to set Port Range Forwarding.
First I login with name and password.
Then I go to Applications and Gaming - Port Range Forwarding.
I enter name, ports, protocol, server and hit Save.
And then the router ask me again to enter a logon name and password.
When I enter this, apparently not the correct one for it asks me again for a name and password.

Can anyone help me with this please?

 

[neb]

I did a reset, reconfigured everything and now it's working fine.