Does anyone happen to know the password for ZTE 931DII VDSL modem web admin?

I am a new UniFi subscriber and I need to open a few ports for work related stuff. I have opened the ports on D-link DIR615 but the VDSL blocks all incoming traffic to these ports. And yet, the VDSL modem keeps a few standard ports open, such as 21, 22 and 80. WTF!

I'm sorry if someone has posted the password. I searched this forum but couldn't find it.