Security News > 2023 > May > Microsoft investigates slow Windows VPN speeds after May updates

Microsoft is investigating major speed issues affecting L2TP/IPsec VPN connections after installing recent Windows 11 updates.

Based on reports seen by BleepinComputer since the updates have been available, both updates are triggering the L2TP/IPsec VPN speed issues after deployment.

"No problems connecting to the VPN, just once you get in the speeds are extremely slow and RDP basically just times out. A quick search of the web confirms that KB5025305 causes speed issues on L2TP/IPsec VPN," one Windows admin shared on Reddit.

While there is no way to work around this on affected Windows 11 systems until Microsoft provides a fix, Windows admins have reported that uninstalling the problematic updates will address the issue.

It's important to note that Redmond bundles all security fixes into a single update and, thus, removing the KB5026372 cumulative update will also remove all fixes for recently patched security vulnerabilities, even though it may also resolve the VPN speed issues.

In mid-January 2022, Microsoft released emergency out-of-band updates to address L2TP VPN issues when attempting to connect using the Windows VPN client, caused by January 2022 Patch Tuesday updates.

News URL

https://www.bleepingcomputer.com/news/microsoft/microsoft-investigates-slow-windows-vpn-speeds-after-may-updates/