Detect protocols

Bek

Watchguard detects whether a protocol is encapsulated in other protocols?

Bruce_Briggs

Generally no.
The exception is the TCP-UDP proxy which will look for HTTP, HTTPS, SIP, FTP, IMAP, POP3, and SMTP packets sent on non-standard ports.

About the TCP-UDP-Proxy
https://www.watchguard.com/help/docs/help-center/en-US/Content/en-US/Fireware/proxies/tcp/tcp_udp_proxy_about_c.html