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. Here's who needs which, and how to verify your setup works.
Fix the AS2 decryption-failed MDN error: wrong certificate after rollover, key mismatch, 3DES vs AES conflicts, corrupted PKCS#7, and wrong certificate purpose.
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 — DIY to hosted.
In-depth technical analysis of AS2 security policies, including CRL checking, certificate pinning, and policy mapping for enterprise deployments.
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.
Definitive guide to AS2 certificates: how public/private keys work, CA-signed vs. self-signed, certificate exchange process, and renewal procedures.
Choose the right AS2 encryption and signing algorithms. Covers 3DES vs AES, SHA-1 vs SHA-256, NIST recommendations, partner requirements, and mismatch errors.
Your AS2 message sends fine but no MDN comes back. Diagnose missing MDNs: async receipt URL issues, firewall blocks, sync timeouts, DNS failures, and more.
An honest technical comparison of AS2 and AS4 messaging protocols. Covers architecture, use cases, migration trade-offs, and when each protocol makes sense.
A practical compliance checklist for the November 2026 DSCSA deadline. Covers EPCIS, GS1 standards, serialization, verification routers, and AS2 data exchange.
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.
The AS2 certificate validation checklist you wish you had last time a cert blew up your connection at 2am. Covers formats, key sizes, chain validation, expiry traps, and every common error message decoded.
DSCSA demands encrypted, signed, auditable data exchange across your entire pharma supply chain. Most AS2 configurations have gaps. This is the checklist to close them.
60% of MDN failures are algorithm mismatches. Here's how to diagnose AS2 MDN errors, sync/async confusion, signature verification, MIC mismatches, and fix them fast.
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.