I have several multiuser sites, after a runaway program

I have several multiuser sites, after a runaway program rubbed my VPN down to its knees, the problem was located. All the sites are up and I've lost no data.

what I have lost, is the ability to login with wp-admin. what could be, and to all these different sites and networks?

When the technician for my host was troubleshooting it, he mentioned that he was disabling the wp-admin login?

Thanks
Ron