Help with error "...may be caused by a mismatch in the TLS version. ..."
I am trying to connect to my work VPN server using FortiClient v. 22.214.171.1247 on Windows 10 x64, but every time I enter my username and password, it says "Warning - Failed to establish the VPN connection. This may be caused by a mismatch in the TLS version. Please check the TLS version settings in the Advanced of the Internet Options. (-5029)".
I have checked the Advanced panel under Internet Options, which has checkboxes for "Use SSL 3.0", "Use TLS 1.0", "Use TLS 1.1", and "Use TLS 1.2". When I first checked, the boxes for SSL 3.0 and TLS 1.0 were unchecked, and TLS 1.1 and TLS 1.2 were checked. I tried checking TLS 1.0 in addition to 1.1 and 1.2 and restarting my computer, but it still fails. I have tried several other combinations (like unchecking 1.1 and 1.2, so only 1.0 was checked, or checking only 1.1 or only 1.2, etc.) to no avail. I have also tried uninstalling and re-installing the FortiClient app with no success.
This started after my computer told me it needed to restart to finish installing some Windows updates, specifically KB4093112 (2018-04 Cumulative Update for Windows 10 Version 1709 for x64-based Systems). I had also just installed Visual Studio Build Tools 2017, in case that may be pertinent.
I am also emailing my workplace's computing services department in case they have seen this issue before, but any assistance would be much appreciated.
The Fortinet Security Fabric brings together the concepts of convergence and consolidation to provide comprehensive cybersecurity protection for all users, devices, and applications and across all network edges.