IPsec VPN Troubleshooting (Video)

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In this video, you will learn how to troubleshoot a site-to-site IPsec VPN that provides transparent communication between a Headquarters FortiGate and Branch office FortiGate. This video will show you how to diagnose common problems when your tunnel connection fails, and how to adjust your settings when the tunnel drops on and off. This video includes common Preshared Secret Key issues, Security Association or “SA” proposal errors, quick mode selector issues, and more. By the end of this tutorial you should have a better understanding of how to use these debug commands for basic troubleshooting.This video is recorded on FortiOS 5.2.6, and although the GUI options may vary, the troubleshooting tips and CLI commands are relevant for most recent builds.

The recipe for this video is available here.

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Kayla Robinson

Kayla Robinson

Technical Writer at Fortinet
Kayla Robinson works in Ottawa as part of Fortinet's Technical Documentation and New Media team. With a Bachelor's degree from Carleton, and a graduate certificate in Technical Writing from Algonquin College, she enjoys creating FortiOS Cookbook videos.
Kayla Robinson

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  • Nestor Fernandez

    Hi Kayla could you please help me with this log error. Tanks a lot

    24/07/2017 09:29:37 a. m. Error VPN FortiSslvpn: 6364: poll_recv_ssl -> SSL_ERROR_WANT_WRITE
    24/07/2017 09:29:55 a. m. Error VPN (repeated 1070 times in last 19 sec) FortiSslvpn: 6364: poll_recv_ssl -> SSL_ERROR_WANT_WRITE
    24/07/2017 09:29:37 a. m. Error VPN FortiSslvpn: 6364: poll_recv_ssl -> SSL_ERROR_WANT_WRITE
    24/07/2017 09:29:55 a. m. Error VPN (repeated 1070 times in last 19 sec) FortiSslvpn: 6364: poll_recv_ssl -> SSL_ERROR_WANT_WRITE
    24/07/2017 09:29:56 a. m. Error VPN FortiSslvpn: 6328: error: poll_send_ssl ->SSL_get_error(): 5, try:19468
    24/07/2017 09:29:56 a. m. Error VPN FortiSslvpn: 6328: error: poll_send_ssl -> WSAGetLastError():2746, try:19468
    24/07/2017 09:29:56 a. m. Error VPN FortiSslvpn: 6328: error: poll_send_ssl ->data size: 1364, try:19468
    24/07/2017 09:29:56 a. m. Error VPN FortiSslvpn: 6328: [handle_driver_read_event]: error: poll_send