Microsoft introduced a monthly update rollup for KB4480970 for Windows 7 systems. However, according to some user feedback, the system’s network settings did not work properly after installing this update. If you install the January Patch Tuesday on a Windows 7 device on an SMBv2 network, you will experience unexpected network connectivity issues.
A Reddit user said, “after installing KB4480970 on a Windows 7 PC hosting an SMBv2 share it could not be connected to anymore. After deinstalling the update it was working again.” Another Reddit community user also commented, “we’ve ran into the same issue on a Windows 2008 R2 server. We also cannot authenticate with our TFS server hosted on the same box. Will rollback and see.EDIT: Uninstalling the update fixed both issues for us.”
According to a post posted on the Microsoft TechNet forum, the user report KB4480970 caused a problem with the Windows 2008 R2 server. The report also shows that uninstalling the update resolves the issue. How to fix SMBv2 issues caused by Windows 7 KB4480970:
1. Open the Windows Control Panel and navigate to the Programs and Features > Installed Updates, which lists all the most recent updates installed on your system.
2. You can manually browse the list and find the update KB.
3. Once found, right click on it and select Uninstall from the context menu.
4.Windows will uninstall the update.
5. Restart your PC and you will be able to access the network again.