Hot Take Microsoft investigates slow Windows VPN speeds after May updates

MuzzMelbourne

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Mar 13, 2022
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Microsoft is investigating major speed issues affecting L2TP/IPsec VPN connections after installing recent Windows 11 updates.

According to reports from Windows users and administrators, the connection bandwidth issues were first caused by the optional KB5025305 April 2023 non-security update.

Redmond rolled the same fixes and improvements bundled in the KB5025305 preview update into the mandatory KB5026372 cumulative update released during this month's Patch Tuesday, causing the connection issues to be experienced by a larger number of Windows users.

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.

"Our users are facing this, with a strange oddity: a group of 5-6 users is able to get 100m down and 80m up speeds, but the vast majority get sub 1m down and sub 1m up speeds," another admin told BleepingComputer.
 

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Apr 21, 2016
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According to reports, Microsoft is investigating major speed issues affecting L2TP/IPsec VPN connections after installing recent Windows 11 updates. The issues were initially caused by the optional KB5025305 April 2023 non-security update and then rolled into the mandatory KB5026372 cumulative update released during this month's Patch Tuesday, causing connection issues for a larger number of Windows users. Both updates are triggering the L2TP/IPsec VPN speed issues after deployment. Windows users and administrators have reported experiencing slow speeds and timeouts once connected to the VPN. Microsoft is working to resolve the issue.
 

MuzzMelbourne

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Mar 13, 2022
599
Microsoft stuff has been poorly written, porous, badly implementd rubbish from day 1.

Why this software is so popular is beyond me...

But, if I ever come up with terrible idea, I want Bill Gates as Sales Manager...
 

Veeresh

New Member
Sep 12, 2023
1
Work around solution until microsoft fixes the issues.

go to services.msc -> Routing and remote access -> change "start type" to Automatic (Delayed start) and click "Start"

Establish a LT2P connection. FIXED

Veeresh
 
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