Can't connect to IPsec VPN in Windows 11

[jfbueno]

I wasn't able to connect to an IPsec VPN through FortiClient VPN (7.0.2.0090 free) when updated to Windows 11 (build 22000), SSL VPNs were working fine. When I downgraded to Windows 10 (21h2 build 19044.1415) the IPsec VPN started working again.

This is the error that I got on FortiClient

 

And this is the log that I exported

12/28/2021 4:02:55 PM	info	sslvpn	date=2021-12-28 time=16:02:54 logver=1 id=96602 type=securityevent subtype=sslvpn eventtype=status level=info uid=19AEBE88942A48F59578C42AA765D590 devid=FCT8003159070034 hostname=DESKTOP-5BJFTJ3 pcdomain=N/A deviceip=192.168.224.1 devicemac=<redacted> site=N/A fctver=7.0.2.0090 fgtserial=FCT8003159070034 emsserial=N/A os="Microsoft Windows 11 , 64-bit (build 22000)" user=bueno msg="SSLVPN service started successfully" vpnstate=

12/28/2021 4:03:04 PM	info	system	date=2021-12-28 time=16:03:03 logver=1 id=96823 type=systemevent subtype=system eventtype=status level=info uid=19AEBE88942A48F59578C42AA765D590 devid=FCT8003159070034 hostname=DESKTOP-5BJFTJ3 pcdomain=N/A deviceip=192.168.224.1 devicemac=<redacted> site=N/A fctver=7.0.2.0090 fgtserial=FCT8003159070034 emsserial=N/A os="Microsoft Windows 11 , 64-bit (build 22000)" user=bueno msg="Checking for updates"

12/28/2021 4:04:26 PM	info	ipsecvpn	date=2021-12-28 time=16:04:25 logver=1 id=96566 type=securityevent subtype=ipsecvpn eventtype=status level=info uid=19AEBE88942A48F59578C42AA765D590 devid=FCT8003159070034 hostname=DESKTOP-5BJFTJ3 pcdomain=N/A deviceip=192.168.224.1 devicemac=<redacted> site=N/A fctver=7.0.2.0090 fgtserial=FCT8003159070034 emsserial=N/A os="Microsoft Windows 11 , 64-bit (build 22000)" user=bueno msg="loc_ip=192.168.100.2 loc_port=500 rem_ip=<vpn-external-ip> rem_port=500 out_if=0 vpn_tunnel=RS IPsec action=negotiate init=local mode=aggressive stage=1 dir=outbound status=success Initiator: sent <vpn-external-ip> aggressive mode message #1 (OK)" vpntunnel="RS IPsec"

12/28/2021 4:04:38 PM	warning	ipsecvpn	date=2021-12-28 time=16:04:37 logver=1 id=96561 type=securityevent subtype=ipsecvpn eventtype=error level=warning uid=19AEBE88942A48F59578C42AA765D590 devid=FCT8003159070034 hostname=DESKTOP-5BJFTJ3 pcdomain=N/A deviceip=192.168.224.1 devicemac=<redacted> site=N/A fctver=7.0.2.0090 fgtserial=FCT8003159070034 emsserial=N/A os="Microsoft Windows 11 , 64-bit (build 22000)" user=bueno msg="No response from the peer, phase1 retransmit reaches maximum count" vpntunnel="RS IPsec" locip=192.168.100.2 locport=500 remip=<vpn-external-ip> remport=500

This is a log exported after a successful connection (in W10)

12/30/2021 8:24:23 AM	info	ipsecvpn	date=2021-12-30 time=08:24:22 logver=1 id=96566 type=securityevent subtype=ipsecvpn eventtype=status level=info uid=19AEBE88942A48F59578C42AA765D590 devid=FCT8003159070034 hostname=DESKTOP-5BJFTJ3 pcdomain=N/A deviceip=<my-external-ip> devicemac=<redacted> site=N/A fctver=7.0.2.0090 fgtserial=FCT8003159070034 emsserial=N/A os="Microsoft Windows 10 , 64-bit (build 19041)" user=bueno msg="loc_ip=192.168.100.2 loc_port=4500 rem_ip=<vpn-external-ip> rem_port=4500 out_if=0 vpn_tunnel=CIEE-RS action=negotiate init=local mode=quick stage=2 dir=outbound status=success Initiator: sent <vpn-external-ip> quick mode message #2 (DONE)" vpntunnel=CIEE-RS

In this log the loc_port and rem_port are different (4500, in the other log it's 500), also the deviceip is my external IP, not a local IP (that doesn't look like an IP that my machine would be using).

I don't know if that's causing the problem, but it's all I can find.

Does anyone have any tips?

[VincentCA]

Now that I'm looking, I do see a Realtek, but it's for the USB (Realtek USB GbE Family Controller).
Other than that, this is what I have: 

• Fortinet SSL VPN Virtual Ethernet Adapter
• Fortinet Virtual Ethernet Adapter (NDIS 6.30)
• Killer(R) Wi-Fi 6E AX1690i 160MHz Wireless Network Adapter (41 INGW) #4

Primarily I use WIFI when trying to connect to the ipsec VPN.

[BillWabo]

Try to install the windows 10 on windows 11.  That worked for us.(Win10 Auto Installation Program (NDIS)

https://www.realtek.com/en/directly-download?downloadid=0b79af1e7509a5c294810f433179dbe6

Let’s us know it’s working!

[VincentCA]

Tried installing it and got the following error. After finishing the install it still doesn't connect.

Side-note: Link you sent didn't work, but I followed the download path of the original solution and downloaded the NDIS from there.

[mdilena]

Thanks @SkepticSensei , I just downgraded to 10.54 and everything started working!

[BillWabo]

Fortinet know the problem.

Fortinet Answer: "...there will be no fix from the forticlient side as this is not a forticlient issue.This issue is with Realtek drivers and a drivers update might fix the issue.To avoid this issue, try not to use the latest Realtek driver, it has the bug, just use the driver that comes with Windows and that should work."

There is a new Driver from Realtek 2023/02/24 version 124.011 , 1125.011 , 1166.011 , 1168.011 and it's not fixed.

I tried to contact Realtek about it... no answer...So good luck to reach Realtek about it!

Windows 10 driver on windows 11 works fine.

[gs1]

wow... just wasted half a day because of this. thanks SkepticSensei for the workaround. absolutely crazy that this still is an issue and nobody cares :(