[ubuntu] Network manager keeps on asking for password and fails to connect

Hi, I'm running Ubuntu 16.04 on my Dell M4800 laptop. At my office I connect to the a wired network via 802.1 authentication. I recently changed my password and hence updated the stored password for the connection (in connection settings). Then when trying to connect, a pop up window asks for a password for the connection. And when I insert the password, it bounced back and asks again. It keeps on like that without connecting to the network.
I've even edited the connection configuration file in /etc/NetworkManager/system-connections/ by inserting the password field, but no change. I've also tried deleting the connection and re-creating a new connection (with a different name), but the problem is still there.

I connect to the same network via wifi (using the same credentials) from the same machine and it works fine. Does anyone have any idea as to what could be the problem?

thanks!

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[ubuntu] Network manager keeps on asking for password and fails to connect