Hrm.....I am looking at the forums, does anyone know if their own website is also hosted on a VPS?
I am not 100% sure here, but if people are saying the main virtuozzo CP is up and saying login not allowed, this sounds like their VZ license(s) expired. I had this happen once due to a NIC change and it did the same thing as what you are seeing. I am not going to speculate about anything there, but I do know that SWSoft only issues us 1 year licenses and I have to ask my salesperson for a renewed license.