Are you having troubles maintaining your connection to the QQ International servers? First of all we encourage you to double check your current network environment and exclude all common connectivity problems (router malfunction, disrupted network, firewalls…).
If you’ve done all of the routine checks and your network is working fine then there might be a conflict in your computer configuration or LAN setup. Before trying the following steps, please make sure that you installed the official version of QQ International from our website. Next, go to My Documents->Tencent Files, find your QQ ID folder and delete it (make a copy of the folder if you want to restore your chat history and received files).
Still no luck? Try changing the following:
QQ Server: go to the Login Settings panel when you start up QQ International and change the server type to UDP
Proxy: if you are specifically using a proxy when connecting to QQ International servers please try to disable it from the above Login Settings panel.
Private Network or VPN: if you’re connecting to the Internet through a private network such as a corporate intranet or a personal VPN then you might want to either disable the VPN or check with your network administrator because QQ International could have been blocked (many companies forbid employees to use instant messengers).