I cant sync email (Exchange) or load video (Tumblr App) when on home wifi

[AC Question]

As of yesterday morning my ability to sync to Exchange or load videos on Tumblr has quit working. It worked fine until then. When I turn off wifi, it works perfectly. I dont have a firewall turned on that I'm aware of and nothing has changed on my network. Could my wifi router have updated itself and thus prompted new settings to take over preventing these from syncing?

 

[B. Diddy]

Welcome to Android Central! First, try rebooting the router by unplugging its power for 10 seconds. If that doesn't work, try logging into the router's settings (from your web browser -- see the router manual), and temporarily disable IPv6.

If that doesn't help, you could try changing the DNS server: http://www.howtogeek.com/167533/the-ultimate-guide-to-changing-your-dns-server/