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Internet from datacard doesn't work when LAN is enabled

I am unsure if this is a hardware problem or software. I am assuming it's a software based problem and so I am posting it here.

I have a Huawei E303C datacard with a Docomo3G connection. When I insert the datacard to the system and connect successfully, internet works fine and I can browse without problems. I have no enabled LAN connection during this time.

So now, I insert the LAN cable to my ethernet port to connect to my another system in another room. LAN is successfully connected and I can access the other system. But now, internet is no longer working! The dialer shows that I am connected to the internet, but web pages don't open. If I disable the LAN again, internet magically comes back. Keep in mind I am not disconnecting and reconnecting with the dialer at any time. Even if I do that, there is no change.

But the strange thing is that suppose I am on a google chat when net is working, if I enable the LAN connection, internet goes kaput, but the chat which was going on still works. But if I try to open another chat window with another person, it won't work again.

Any help will be usefull here, fellas. Am running Windows 7 (64-bit).
- Datacard connection in "Network Connections" - Mobile Broadband Connection
- LAN connection in "Network Connections" - Local Area Connection 2


King of Heroes
In the Network Connections page, click Advanced->Advanced Options(or it may be Tools->Advanced Options) from the menu.There, you can see the priority of your connections.
Change it according to our needs.


Super Moderator
Staff member
its not the position which matters.in the network sharing center---adapter settings right click the docomo connection & select "set as default connection".
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