You enable TLS inspection.
Immediately a few applications stop working.
Why?
Because the firewall isn't simply reading encrypted packets.
It becomes part of the TLS trust path.
A simplified flow:
Client
→ Security Gateway
→ Decrypt
→ Security Inspection
→ Re-encrypt
→ Server
The client now needs to trust the certificate authority used by the gateway.
That creates several engineering problems:
CA distribution
endpoint management
certificate pinning
application compatibility
bypass policy
performance
privacy
Managed corporate laptops are relatively straightforward.
Unmanaged BYOD isn't.
A useful deployment strategy is:
Deploy the inspection CA
Select a small pilot group
Enable inspection
Identify application failures
Create narrow exclusions
Measure gateway load
Expand gradually
SonicWall DPI-SSL is a useful real-world example because it supports inspection policies and granular exclusions.
The lesson applies beyond SonicWall:
TLS inspection is part firewall, part PKI, part endpoint management.
Practical example:
https://sistro.net/sonicwall-dpi-ssl-inspeccion-https
Tags: cybersecurity tls networking security
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