Problem connecting IPsec IKEv2 VPN with FortiClient 7.4.5 using an LDAP user

Forum|Forum|4 months ago
February 3, 2026
3 replies
3575 views

Hello community,

I have an IPsec VPN with IKEv2 connected to FortiClient 7.4.5, which connects perfectly when I log in with a local user created in Forti. The problem is when I log in with a domain user; it doesn't connect and I get the following error: "IKE message other than DPD retransmit to maximum".

Could you lend me a hand?

Thanks

funkylicious

SuperUser

https://community.fortinet.com/t5/FortiGate/Technical-Tip-IKEv2-dial-up-VPN-with-LDAP-authentication/ta-p/394380

look into EAP-TTLS

"jack of all trades, master of none"

magliano

Staff

Hi @acarrascosa1 ,

Could you please follow this KB and share the debug output?

https://community.fortinet.com/t5/FortiGate/Troubleshooting-Tip-IPsec-VPN-tunnels/ta-p/195955

With this information, I might be able to guide you a bit more toward the solution.

Best regards

A

Alwyn

New Member

getting same error with SAML login "IKE message other than DPD retransmit to maximum" only for few users, it works fine on hotspot. any idea what could be causing it? 7.4.7 forticlient version

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