make sure you installed the updated version of the Uplay client from the Uplay website
you can get it here https://uplay.ubi.com/
if you still can not connect its possible you have a bigger problem with your system
see this page https://support.ubi.com/en-US/FAQ/9/...0000000eio0CAA
If you continue to have issues PLEASE see the troubleshooting tips section here http://steamcommunity.com/app/298110...6486417358966/
or open a support ticket with Ubisoft Support at https://support.ubi.com by clicking on My Questions in the upper left corner of that page.
You can also call them on the phone during regular support hours <--(BEST OPTION)
You can find phone number information here: https://support.ubi.com/en-US/FAQ/60...0000000eiChCAI
You can also try to contact them via social media.
Facebook: https://www.facebook.com/UbisoftSupport
Twitter: https://twitter.com/ubisoftsupport