School & Corporate — Fortinet / Institutional Firewalls#

Overview#

Schools, universities, and workplaces often deploy enterprise firewalls like Fortinet, Palo Alto, or Cisco to enforce acceptable use policies. These systems perform DPI, SSL inspection, URL filtering, and application identification.

What It Blocks#

• Social media and streaming sites (by URL category)
• Peer-to-peer applications and file sharing
• VPN and proxy protocols (OpenVPN, WireGuard, Shadowsocks, Tor)
• Known proxy and VPN provider IPs and domains
• UDP traffic on non-standard ports
• Sometimes only allow port 443
• Certain application signatures (gaming, VoIP, torrents)

What Works#

• VLESS + REALITY — Effective if the firewall does not inspect outbound TLS connections; depends on whether the firewall performs MITM SSL decryption.
• VMess + WebSocket over port 443 + TLS — Blends with HTTPS traffic.
• Hysteria2 over port 443 — QUIC on port 443 often passes since it looks like HTTP/3.
• TUIC over port 443 — Similar approach as Hysteria.
• DNS over HTTPS (DoH) — Bypasses DNS-level blocking without evading IP blocking.

What Usually Does Not Work#

• Standard VPN clients without obfuscation — most schools block common VPN ports and protocols.
• Direct SOCKS/HTTP proxies — easily identified by DPI.
• Tor — Tor nodes are often on blocklists.
• UDP-based protocols on non-standard ports.

Tips#

• Use port 443 for everything — it is almost always open.
• Use DoH to evade DNS filtering even if other methods fail.
• Institutional firewalls typically have a narrower blocklist than national firewalls — server IP rotation is very effective.

Caveats#

• If the firewall does SSL/TLS MITM inspection, most proxy traffic is detectable — though pinning or custom CA trust may bypass it.
• IT administrators can see connection metadata (destinations, timing, volume).
• Policy violations may result in network suspension or disciplinary action.
• Client software installation may require admin rights (Applies to TUN mode)