From the InterceptSuite Team

October 6, 2026·7 min read

Debugging a Custom Binary Protocol: Capture, Edit, Resend

A practical workflow for debugging a custom binary protocol: capture real traffic, read it in hex, change one field at a time, resend it, and compare the server's replies.

QUIC

Intercepting QUIC and HTTP/3 Traffic When mitmproxy Isn't Enough

How to intercept QUIC v1 and raw HTTP/3 traffic from desktop apps with InterceptSuite, and how it compares with mitmproxy's experimental QUIC support.

Release

InterceptSuite 2.0.0: Replay, Interception Rules, Scope and AI Access (MCP)

InterceptSuite 2.0.0 adds Replay for non-HTTP protocols, interception rules, Scope, TLS pass-through, HTTP/3 over QUIC, a hex editor and an MCP server so Claude Code can drive your MITM proxy.

IoT

IoT Traffic Interception: MQTT, CoAP, DTLS and QUIC (Guide Hub)

A starting point for intercepting IoT and embedded device traffic: what MQTT, CoAP, DTLS and QUIC need, how to route a device through a proxy, and the guides to follow.

STARTTLS

Manually Test STARTTLS (SMTP, IMAP, PostgreSQL) in a GUI with Replay

Step by step: connect over TCP, exchange the plain-text commands, click Upgrade TLS and continue the session in InterceptSuite Replay. Covers SMTP, IMAP and PostgreSQL.

MCP

MCP for Non-HTTP Traffic: Let Claude Code Analyse Thick-Client Protocols

How InterceptSuite's built-in MCP server lets an AI agent read Proxy History, use Replay and change settings for non-HTTP traffic, with the safety controls you should turn on.

October 6, 2026·7 min read

mitm_relay

mitm_relay, NoPE, PETEP and Deluder Alternatives: Non-HTTP MITM Proxies Compared

An honest comparison of the free tools pentesters use to intercept non-HTTP thick client traffic - mitm_relay, NoPE, PETEP and Deluder - and where InterceptSuite fits as a native GUI alternative.

mitmproxy

mitmproxy vs InterceptSuite for Raw TCP, UDP, DTLS & QUIC

An honest comparison of mitmproxy and InterceptSuite for non-HTTP traffic: protocol coverage, GUI vs scripts, live editing, Replay, STARTTLS and pricing.

October 6, 2026·7 min read

OWASP

Testing OWASP Desktop App Top 10 DA7 (Insecure Communication) on Non-HTTP Protocols

How to test DA7 Insecure Communication in thick clients when the traffic is not HTTP: weak TLS, unencrypted database queries, MQTT, DTLS and custom TCP protocols, with InterceptSuite.

Packet Sender

Packet Sender Alternative with TLS, DTLS and STARTTLS (and a Proxy)

Packet Sender sends TCP, UDP and SSL packets. InterceptSuite adds a MITM proxy so you can capture real traffic, then edit and replay it over TCP, TLS, DTLS, QUIC and STARTTLS.

PETEP

PETEP vs InterceptSuite: Free Java Tool vs Native GUI for Non-HTTP Testing

A fair comparison of PETEP (with Deluder) and InterceptSuite for pentesting non-HTTP thick clients: protocols, repeater, proxy-unaware apps, and cost.

PolarProxy

PolarProxy vs InterceptSuite: Decrypt-Only vs Decrypt-and-Edit

PolarProxy decrypts TLS to PCAP for analysis. InterceptSuite also lets you edit and replay C2 traffic in a lab. A fair comparison for malware analysts and DFIR teams.

Postman for Raw TCP, UDP and TLS: How to Send a Packet to Your Server

Postman can't send raw TCP or UDP. Here is how to send a packet to your own server over TCP, TLS, UDP, DTLS or QUIC, edit it in hex, and read the response, with InterceptSuite Replay.

How to Replay a Captured TCP Session Against a Live Server (and Edit It First)

tcpreplay and tcpliveplay replay packets for network testing. To resend and edit the application payload your client sent, capture it with InterceptSuite and send it again from Replay.

How to Send Hex Bytes Over TCP: netcat and xxd vs a GUI

Send exact bytes to a TCP server with netcat and xxd, PowerShell or Python, then see how a GUI handles binary replies, TLS and repeated tests.