Internet not working well on MBA, after switching network?

Let's say that I turned on my MBAir at home; wifi networking works. Then I close the lid (MBA goes to sleep) and go to different place with different wifi network. When I change the wifi network (eq when I go to nearby coffee shop) something strange happens: from that point I can not reach most of the internet. Even when I come back home, the same problem exists! This is a summary of what I have found:

• DNS is working


• reseting DNS (using com.apple.discoveryd.plist) does not help


• ping is working


• traceroute works


• turning wireless off and on does not help (via ifconfig)


• however, I can not connect to port 80, for example, using wget results with "connection timed out".


• this issue is not related to a target web site, this happens all the time.

The only thing that helps is switching computer off and then back on; but this is not a solution for me.

Can any one recommend a solution, preferably in terminal (so I can issue the fix everytime when I experience it)?

I have MBA 2013 and Yosemite installed.