Network Socket Lock

If a network socket is locked, the connection is completely unavailable. If and why a network socket is locked can be queried from the Support.

After a network socket lock, the following two things need to be done, to be able to use the network socket again:

  1. Resolve the cause, which cause the network socket lock (see below)
  2. after resolution of the cause unlock the network socket


Wifi routers or Windows computers with activated internet connection sharing can send announcements through UPNP, that they provide internet gateway connectivity. This causes network problems on other Windows PCs with activated UPNP client service discovery. Due to this, all users with an active UPNP wan gateway will be locked.

The problem can be fixed by disabling the UPNP server and then unlocking the network socket through the Hotline. Instructions how to disable a UPNP server can be found at the follwing links.

When using a wifi router, please consult the manual on how to disable the upnp server of the router.

Do not forget to unlock the network socket afterwards.

IPv6 Router advertisements

Some computers running Windows Vista, 7 or higher may be misconfigured and send an IPv6 router advertisement to the network. They provide router functions through this mechanism. This can cause massive network disturbance and network sockets will be locked when this is detected. The problem can be solved by disabling IPv6 completely or by disabling IPv6 router advertisements. Afterwards the network socket can be unlocked by calling the Hotline.

Windows 8:

Windows 7 and Windows Vista:

Do not forget to unlock the network socket afterwards.

Violating the network policy (ARP-Spoofing, Static IP address,...)

If the network port is locked because of ARP-Spoofing, the IP address is often set to static (no DHCP-Client). IP addresses must be obtained automatically via DHCP. There may be other reasons why the network port is locked because of ARP-Spoofing, read more.

Do not forget to unlock the network socket afterwards.

Virus infection

When virus infections are reported (for example when the computer is sending spam mails), network sockets will be locked. If a socket is locked due to a virus, it might be a trojan which is capturing data input from the keyboard or other data. In such cases the system should be cleaned in your own interest. In most cases this can only be resolved by a complete reinstallation of your computer. After a successfull cleanup the network socket can be unlocked by the Technical support.

DHCP server

Some users connect a DHCP server to the network, which is not allowed since it would cause massive network trouble. The network socket will be locked if this is detected. In most cases a wifi router is connected, which is running a DHCP server. The device must be configured properly, so that no DHCP server is active anymore.

Do not forget to unlock the network socket afterwards.

Other locks

A network socket can be locked due to other reasons, for example if the network policy is violated. A network socket will always be locked, if network trouble is caused by a connected device, like DOS attacks.

Zuletzt geändert: 20.10.2014