Can not sign in with Rasplex

Hi!
As of Yesterday evening, all my Rasplex unix are refused to sign in and can not find servers.
Just Search option on menu.
In settings, is says Trying on login, but nothing happens.
All rasplex clients run version 1.6.2.123-e23a7eef
None of my android of web client have problems

Is the problem still persisting?
Can you check your time is up-to-date?
Wifi or Ethernet?

Hi!
You are so right
System time updates from my local ntp service in the router. Seams like the ntp set in the router has stopped working.
Not many other devices on my network uses ntp, set up by user, so nothing else was effected.
Updated the npt servers in my router and all is now working again.