Windows 10: Problem when enabling Firewall with Firewall exceptions and Unified Write Filter with UWF...

Hello,


I have a problem when enabling Firewall with Firewall exceptions and Unified Write Filter with UWF exclusions. I have observed this problem in the following Windows 10 versions:
- Windows 10 Enterprise 2016 LTSB 1607
- Windows 10 Enterprise 2019 LTSC 1809


The Windows 10 machine is configured as follows:
- There is an application 'X' installed in "C:\folderX" directory.
- Firewall is enabled. Application 'X' is added as an exception to Firewall.
- UWF is enabled, C:\ drive is protected by UWF and "C:\folderX" directory is added as an UWF exclusion.
- Application 'X' needs to communicate with other external machines/applications via Ethernet Network interface.


The following two scenarios are observed:
a If both Firewall and UWF are enabled, Application 'X' does NOT communicate with external machines/applications.
b If Firewall is disabled or UWF is disabled or both are disabled, Application 'X' does successfully communicate with external machines/applications.


How can I solve the issue in scenario a? This is, how can I have Firewall and UWF both enabled at the same time and Application 'X' communicating to external machines/applications?


Is this a known bug to Microsoft? If yes, is there any fix?


Thanks.

:)

 

Regarding UWF (Unified Write Filter)

I have some HP thin-client where Windows 10 Enterprise LTSB custom image is installed. These clients having 4 GB RAM is installed and 2.9 GB is usable because of video memory.

As we know in the write filter environment all writes are in overlay and system must reboot to clear the overlay memory otherwise system will get crashed after overlay exhausted.

In this OS we have only one drive C which is protected by UWF and additional drive Z which is RamDisk for temporary writes and maximum of 768 MB, so its not possible to create page file in protected volume because while enabling UWF page file don't exist
any more and the other drives are Z very less in memory.

Now using some tool while booting OS, i have moved 8GB of partition from c drive and created additional drive D which is not protected then configured page file range 4.5 GB to 7GB in this drive after enabling the UWF still page file present and working.

Now i have know UWF overlay size and how to calculate the system UP time which is depend upon the size of the overlay size.

Is it good to set 600 MB or 1000 MB for overlay size and what are the UP times, now system is not complete running as i can see in it used overlay memory in 2 days around 100 mb ?

Thanks in advance.

 

Unified write filter servicing screensaver not showing up

Joy,

Thank you for your reply. sfc /scannow did not find any violations. The power troubleshooter however has NOTHING to do with UWF not executing the correct activity. It's master servicing script goes through all of the steps it's supposed to, but the servicing
mode itself does not act like it should. That is the problem. I require uwf servicing mode to execute and complete its login process, as well as show the screensaver. Currently it does neither.

I will appreciate further assistance.

Were you able to find a solution?

 

Windows 10 Firewall problem - Firewall won't switch on

What happens when you try to enable Windows Firewall..any errors?

Launch Services.msc and set these services to Automatic.

• Windows Firewall
• Base Filtering Engine

Restart Windows.