Blue screen (BSOD) caused by the firewall infrastructure of Advanced EPDR/EDR products
Related Products_
- Advanced EPDR
- Advanced EDR
Issue Status_
Tracking ID: WGUA 1881
Status: Resolved
Type of solution: Hotfix
Symptoms_
Blue screen (BSOD) with reference to the NNSDNS.sys driver caused by the firewall infrastructure of Advanced EPDR/EDR products. This issue may occur with any of these protections enabled on the affected endpoint: Advanced Protection, web protection, firewall protection, and web filtering protections.
Solution_
Apply the available hotfix on the affected endpoint.
- Download and save the hotfix file to the endpoint:
hf-wgua1881-getdomainname.exe - Double-click the downloaded file.
- The hotfix installation does not require restarting the computer.Note: To download an unattended or silent version of the hotfix, click here. The hotfix is applied after the next system restart.
Release Notes_
Next, find all the changes the hotfix includes.
Affected Versions
- v8.00.21.X.
- From v8.00.22.0010 to v8.00.22.0022.
To see your Cytomic product version, see this article.
File Details
The hotfix updates the following files:
| File name | Location | File Version | Modified Date | Hotfix to be included in future versions? |
|---|---|---|---|---|
| NNSDNS.sys | C:\Windows\System32\Drivers\NNSDNS.sys (8.00.21.X Protections) | 1.3.0.121 | October 27th, 2023 | Yes v8.00.22.0023 |
| NNSDNS.sys | C:\Windows\System32\Drivers\NNSDNS.sys (8.00.22.X Protections) | 7.0.0.134 | October 26th, 2023 | Yes v8.00.22.0023 |
Verify Hotfix Application
To confirm the correct application of the hotfix, check the file version (in File Details section) or else, verify the values of these Registry keys:
| 32 bits Architecture | 64 bits Architecture | ||
|---|---|---|---|
| Registry Key | Value | Registry Key | Value |
| HKEY_LOCAL_MACHINE\SOFTWARE\Panda Software\Setup\Hotfix history\HF_NNSDNS_GetDomainName | Revision [REG_DWORD] 1 | HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Panda Software\Setup\Hotfix history\HF_NNSDNS_GetDomainName Revision | [REG_DWORD]
1 |
| HKEY_LOCAL_MACHINE\SOFTWARE\Panda Software\Setup\Hotfix history\HF_NNSDNS_GetDomainName | Result [REG_DWORD]
0 = Success |
HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Panda Software\Setup\Hotfix history\HF_NNSDNS_GetDomainName Result | [REG_DWORD]
0 = Success |
