I had this problem before and this worked for me.
https://m.youtube.com/watch?v=cZlWVeJyNJw
If you for some reason can't see adnotation here is what you need to do:
1. In Steam right-click on Dota 2 game
2. Choose Properties
3. In General Tab click Set Launch Options...
4. In TextField enter:
+clientport 80
try different ports if this one won't work some people suggest to use ports between 27005 and 27032
5. Click Ok
6. Launch DOTA2 from Steam.
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Oh and I am having trouble joining SEA and AUS servers but when I change to US west there was no problem but I would really like to play on Aus with my friends :/
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So hey guys ! Im writing to this forum as all the forum threads didn't answer my problem . So here it goes , I am unable to join matches more frequently than before and out of lets say 5 games I will be able to join 2-3 of them while the other 2 will have this error "disconnected from server unable to establish connection" I was hoping you guys would help me out . I also opened the console when I was connecting to the match and it would be connecting non-stop till i get dc from it . It is not my ISP nor router as my friend came over a couple days ago and joined a server without any problems what so ever , so I'm relying on you guys for help and possibly answers :)
Hope to hear from you guys soon