WatchGuard published a new security vulnerability on December 18, 2025, which you absolutely must be aware of:
WatchGuard Firebox iked Out of Bounds Write Vulnerability (CVE-2025-14773)(WGSA-2025-00027) CVSS 9.3
IPsec problem with Windows 10/11 and Realtek Network card
There are issues with some drivers for Windows 10 and Windows 11 when using IPsec VPN. The IPsec tunnel cannot be established. On both operating systems the issue is related to the driver of the network card. The problematic driver was deployed via Windows Update. In many cases the network…
Update June 2023: IPSec VPN Issues: No traffic through the tunnel caused by dropped ESP packets on the DSL modem
We have recently seen an accumulation of problems with IPSec VPN tunnels. The problem was recognized by Swisscom and fixed with a new firmware. Further information can be found in the release notes (on this page). The firmware version from which the problem was fixed is: 9.52.12 B16++ (June 2023).
Fortigate S2S-Dialup VPN – Traffic does not run through IPsec tunnel anymore
After Fortigate upgrade v6.4 > v7.0.1 (or later) the S2S-dialup VPNs did not work anymore. Tunnel negotiation is successful and phase 1 and 2 get up. Traffic from spoke is routed into the tunnel, but is seems that the traffic is not received by the hub.
