Technical Tip: Interpreting WSAGetLastError() in FortiClient Debug log

[Debbie_FTNT]

Description
This article describes how to interpret 'WSAGetLastError()' messages sometimes observed.

Solution
FortiClients can sometimes have connection issues with SSLVPN.

This sometimes includes error messages as follows:

Error    VPN    FortiSslvpn: 2148: error: poll_send_ssl -> WSAGetLastError():2745, try:1
Error    VPN    FortiSslvpn: 10908: error: poll_recv_ssl -> WSAGetLastError():2746

These errors are Windows Socket event errors, expressed in hexadeximal format.
WSAGetLastError():2745, for example, is the equivalent of error code 10053.

A list of error codes can be found here:
https://docs.microsoft.com/en-us/windows/win32/winsock/windows-sockets-error-codes-2

The above FortiClient error 2745 translates to decimal value 10053, meaning:

WSAECONNABORTED – Software caused connection abort.
An established connection was aborted by the software in the host computer, possibly due to a data transmission time-put or protocol error.

Notes:
Codes can be converted from hexadecimal to decimal values here:
https://www.rapidtables.com/convert/number/hex-to-decimal.html