Can't log in the server interface

Hello !

I recently change internet provider, so i need to reconfigure my static ip addresses. (my old internet provider give 192.168.1.x addresses, now i have 192.168.0.x addresses)

But I have a problem with the log in : I contented screen and keyboard on my home made NAS witch run with omv 5.6.13-1.
After the boot the system ask me to log in and they are 2 scenarios : If i put the wrong user name or password, it tells me something is incorrect. But if I enter the correct user name and password, nothing happen... the system still ask me to log in.

I can't access to the web interface, because the NAS is not even seen on the connected devices (that are monitored in my rooter interface)

I hope some one have a solution to solve the log in problem, or if there is another way to get my NAS log in my new network

Can not write any commands, the system force me to login. And i am 100% sure about the username and the password

I don't know if refreshing browser, but i tried... i still can't access my NAS web interface because there is still the old ip address.

I realy thing i can't... after starting the system, i have this. nothing before.

and again :

If i put the wrong user name or password, it tells me something is incorrect. But if I enter the correct user name and password, nothing happen... the system still ask me to log in.

Sorry for long time before news...

Thanks Soma for your advice... i didn't try to log in as root. it worked.

So from there the problem is easily solved... I enter the command sudo omv-firstaid to reconfigure the network settings and give static ipv4 and DHCP ipv6 addresses

(i needed to do that twice, I don't know why the first try didn't worked)

Than I gave the same static IPv4 via my rooter interface.

That's it every thing works now !
Thanks again !