Why am having issue with yahoomail

Hello house,

I need urgent solution to a problem. We have two links in my office. when one is down and switch to the backup, we find it difficult accessing yahoomail.com, it keeps displaying page cannot to display. but when i connect it directly to a window system it works fine. But on Mikrotik it can’t. On the second link no issue through mikrotik.

Please explain the ‘links’. Are these two separate routers on two internet connections?

http://forum.mikrotik.com/t/pcc-configuration-not-working-as-expected-in-failover-on-lan/41846/1

See Feklar’s replies in that thread. Probably the same issue - the router still has a connection open and puts traffic out the dead link. Clear the connection table as he said and try again.