Expert guides on AS2 connection testing, certificate management, EDI compliance, and troubleshooting common AS2 issues.
Drummond certifies AS2 software products for interoperability. It does not test your AS2 connection. See who needs which, and how to verify your setup works.
When an AS2 connection fails, both sides insist their config is fine. Here's the elimination method for producing evidence instead of assertions.
Fix AS2 HTTP 401 Unauthorized and 403 Forbidden errors: missing basic auth, IP allowlists, wrong AS2-From/AS2-To IDs, TLS client certificates, and wrong URL paths.
Your MDN came back with processed/error: insufficient-message-security. Diagnose missing signing, missing encryption, weak algorithms, and silent partner policy changes.
A $50k consulting engagement, one trading partner, three months of config ping-pong. What really goes wrong in AS2 onboarding, and why validation is broken.
Three free ways to test an AS2 connection: mendelson's public test server, a DIY OpenAS2 instance, and AS2 Certify's automated tester. What each validates and when to pick which.
AS2 has no loopback test: every real validation needs a counterparty. Here's why, what a partner-free test actually requires, and your options from DIY to hosted.
Step-by-step guide for Amazon vendors setting up EDI via AS2, covering Amazon's specific requirements, certificate exchange, and endpoint configuration.
AS2 vs SFTP compared honestly: security guarantees, setup effort, cost, and when each protocol is the right choice for B2B EDI.
Choose the right AS2 encryption and signing algorithms. Covers 3DES vs AES, SHA-1 vs SHA-256, NIST recommendations, partner requirements, and mismatch errors.
An honest technical comparison of AS2 and AS4 messaging protocols. Covers architecture, use cases, migration trade-offs, and when each protocol makes sense.
Step-by-step OpenAS2 setup guide: install the server, configure partnerships and certificates, send a test message, and fix common errors.
Fix AS2 connection errors fast. Covers TLS handshake failures, HTTP errors (401, 403, 502), timeouts, DNS issues, cipher mismatches, and payload errors with exact commands.
Step-by-step guide to setting up an AS2 server. Covers software selection, certificate generation, partnership config, firewall rules, MDN settings, and end-to-end testing.
Diagnose and fix the most common AS2 certificate errors, from expired certs to format mismatches. Practical steps with OpenSSL commands you can run right now.
What Walmart requires from AS2 suppliers in 2026: certificate specs, synchronous MDNs, endpoint and TLS rules, plus an 18 item checklist to run before your testing window.
When your VAN says 'our side is fine' and your partner's VAN says the same thing, you're the one stuck in the middle. Here's how to break the deadlock before it costs you $4,800 and three weeks.
A battle-tested, step-by-step AS2 onboarding guide. Certificate exchange, endpoint config, test messages, MDN verification, go-live, with every gotcha called out before it bites you.