DNS

If you're having the problem on multiple or all sites the problem might be a proxy you are using. Also using another DNS might help.

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It might be possible 1) to also make use of a proxy server, configuring it appropriately in your operating system or in your browser. There are also some free public proxy servers, which are rather slow. Another potential solution is 2) to use one of the so-called DNS redirectors. Be also aware of possible resulting breaches of the respective law :)

To avoid having to wait for the next DNS cache update users may manually flush their DNS cache using the command prompt with administrative privileges and running the following command:
ipconfig /flushdns

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How to override the A1 router DHCP settings in order to allow binding and syncing of Mobile Account in OS X

In order for an Apple computer to bind and synchronize the mobile account with the Open Directory account on OS X Server the DHCP settings must receive consistent DNS information for that server. However with A1 the router allows only using the search domain of .home. However, for consistency, the search domain must match the domain name of the Open Directory server.
If your mobile account won't synchronize with the server, and the server's domain is not .home, check that the Search Domain listed in the System Preferences, Network settings is correct. It is .home if you received your DHCP lease from the wireless network router provided by A1. Change this to match the domain name for your server. If your server is named xxx.tuwienrocks.at, then enter the search domain tuwienrocks.at. Additionally, it may be preferable to have manually entered DNS server data referencing the OS X Server itself. This ensures DNS record consistency between the client computer and the server, which is required to bind to the server and synchronize the mobile account
After changing this domain name and DNS server, it is a good idea to create a new location specifying the home network to store these DNS and search domain settings. When you are at that location use that preconfigured location, otherwise use Automatic for your Network Location.

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