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In most cases, DHCP lease durations are 7 days or less, but sometimes may be set to higher values.
We recommend verifying the DHCP lease duration in the DHCP Manager.
First, change an endpoint's DNS settings to the IPs of the VAs, and then verify the following: Umbrella recommends testing for between 2 and 5 days with several computers, preferably from different areas of your organization, before switching all production traffic to the VAs.
If DNS fails to resolve after modifying your DNS settings, double check the firewall requirements outlined in our Prerequisites article have been met.
The following articles describe manually changing DNS settings for Windows and Mac OS X computers: After successful testing, it's time to start utilizing the VAs for production DNS traffic.
In most network environments using Windows Server, local IP addressing is handled via the DHCP Manager.
Sites and Internal Networks—Add the Internal IPs of your network to gain granularity policies and reports in the Umbrella dashboard.Windows Update just gets stuck at "Checking for updates" screen and Windows 7 doesn't download and install any update.It also affects overall system performance and if you check Task Manager, the process occupies high CPU resources and memory usage.If the new updates which upgrade Windows Update client version, are not installed in a Windows 7 machine, it starts giving this annoying issue and the Windows Update program hangs at "Checking for updates" screen and never downloads updates from Microsoft servers.There are a few working solutions to fix this problem. You can follow these solutions one by one until your problem gets resolved: UPDATE: Before going through all the given solutions, also check following important article: This is the best and easiest solution to fix this problem!
Now it's time to test and eventually point production DNS traffic towards them.