What’s the Best VPN for Bypassing Firewalls on Corporate Networks?

I have had no issues with OpenVPN. If you find yourself on networks that restrict outgoing traffic to just ports 80 and 443, rerouting your VPN server to those ports can also be a clever workaround.

Have you considered ZeroTier? It can sometimes work well for these situations. Also, using a small Fortigate or Palo Alto device dedicated just for VPN might be a worthwhile investment for better reliability.

A lot of places that block VPNs do it because they don’t want users utilizing their network bandwidth for VPN usage. So, what you're really asking for is a VPN that can slip through these restrictions undetected. When conventional VPN protocols like IPSEC or OpenVPN aren’t working, it’s likely a specific setting on those networks. If you're looking to do this for free, keep in mind that corporate firewalls may also block free VPNs. An SSL VPN that runs on your corporate domain with valid SSL credentials might be your best bet. But really, if you’re hitting these roadblocks, sometimes it’s easier to suggest users rely on mobile data instead.

You might want to check out Cloudflare Warp. It's essentially a zero trust proxy that could work for your needs. It's free for up to 50 users, which might suit your company. Just be mindful it functions a bit differently than traditional VPNs.

SoftEther is a good option to look into. It's free and can be configured to operate on port 443, which many restrictive firewalls leave open, helping to avoid typical blocks.