Bug ID 920477: DNS lookup may fail on Windows while VPN is established

Last Modified: Apr 28, 2025

Affected Product(s):
APM-Clients TMOS(all modules)

Fixed In:
7.2.2, 7.2.1, 7.1.9.7

Opened: Jun 24, 2020

Severity: 2-Critical

Related Article: K02144631

Symptoms

DNS lookups to certain sites start failing once the VPN is established.

Impact

Name resolution fails on client devices.

Conditions

- VPN enabled on Microsoft Windows client systems. - IP Filtering is enabled in Network Access configurations. - DNS exclude space contains a wildcard name.

Workaround

Disable IP filtering engine in Network Access configurations.

Fix Information

None

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips