I've tried searching for this but all I can seem to find are posts from people who WANT to use IPv6.  My issue is the opposite.  The Connect wizard is trying to use IPv6, and I want it to use IPv4 instead.

Have an SBS 2011 Essentials network we've been using for several years with no issues joining computers to the domain.   We just got new laptop computers that we will be using with it and are having the issue described here with these new computers.

When I go to the http://servername/connect web page and download and run the connector, the wizard starts, it accepts the network user ID and password initially, but then eventually comes back and gives an error that it cannot join the computer to the network.

What I found is that for some reason, on these new laptops, it's trying to use the IPv6 address of the server instead of the IPv4 address, and this just doesn't work for some reason.

More specifically, when you download the connector software from the servername/connect web site, it puts the IP address of the server in parenthesis as part of the downloaded connector .exe file name.  The connector must use this address from within the parenthesis in some way during the setup.

On the old computers, when I download the connector software, it puts the IPv4 address of the server in the partenthesis in the connector .exe file name.

On the new computers, when I download the connector software, it puts the IPv6 address of the server in parenthesis in the connector .exe file name by default.  This fails the setup.  However, when I download the connector software, I can 'save as" the .exe file, save it to my computer without running it, then rename the file to replace the IPv6 address with the IPv4 address, then manually run the .exe, and the connector wizard goes completely through successfully joining the computer to the domain, and everything works fine after that.

So why does the web interface want to use the IPv6 address when downloading the connector software on these new laptops?  The old laptops still do IPv4 by default just fine?

It is different hardware, with different drivers, but I compared all the settings within the network adapters and protocols between the old and new computers, and they are all the same.  IPv6 is enabled as a protocol on the old computers, but the connector still uses IPv4 successfully on those.  I cannot figure out why it's trying to use IPv6 on the new computers.

Thank you.

Hi,

According to your description, my understanding is that new laptops will automatically to use IPv6 instead of IPv4 address when downloading/installing Connector from SBS 2011 Essentials.

By default, Windows prefers IPv6 over IPv4. But, as you mentioned that IPv4 address is used as parenthesis when downloading connector(displayed in Computerconnector.log). I am unable to reproduce this problem on my test environment, but I have meet the similar problem as yours. 

I would recommend you to confirm that if the fix it tool in below KB is helpful:
https://support.microsoft.com/en-us/kb/2533454#bookmark-fixedalways

Besides, I would recommend you to disable IPv6 on client temporarily, then try to connect to SBS 2011 Essentials, and confirm the result.

Are the new computers has same OS version? And are same as the ode devices? Are these new devices are same hardware/derivers? 

Also, you may try to reset TCP/IP stake on the new device:
https://support.microsoft.com/en-us/kb/299357

Best Regards,
Eve Wang