Set current time via ntp
In case your linux system suddenly jumps back or forward in time and it is a gap much too big, the ntp daemon alone won't cope with it.
Run this line once:
ntpd -q -g
The -g allows for big jumps in time and the -q says run just for this moment and return.
For windows you can trigger ntp time via
net time \\10.20.30.40 /set /yes
where 10.20.30.40 is the IP number or perhaps network name of your time server. You will need a command shell with admin rights for this.