Authentication required when open firefox after installing NoScript

Whenever I open Firefox authentication required pop-up appeared even when NoScript is in Allow Script Globally mode. The text of this pop-up is: 'A username and password are being requested by http://MY_INTERNET_IP_ADDRESS. The site says: "DSL-xxxxx" ' when I type user/pass my router or close it pop-up disappeared, but if fill out with wrong password ask me again.

In NoScript addon there is no any blocked script. Also this happen only when I connect to the router (connect via Ethernet), even not happen when I connect to another router with WiFI. Could you please help me to get rid of the annoying pop-up.