AS2 certificate guides
Fix it, then prevent it
Straight answers to the questions EDI admins search at the worst possible moment — plus how to make the next rollover boring.
start here
My AS2 certificate expired — what now?
What breaks, how to recover fast, and how to keep it from happening again.
How to roll over an AS2 certificate without an outage
The old/new overlap window, partner notification, and the cutover order that keeps traffic flowing.
AS2 "decryption failed" or certificate mismatch
Why a partner can't decrypt your messages, and how to confirm both sides hold the right certificate.
AS2 certificate rollover checklist
A printable, step-by-step checklist for a zero-downtime certificate swap.
by platform
AS2 certificate expired in your platform
Expired AS2 certificate in Cleo
What broke in Cleo Integration Cloud / VLTrader / Harmony, and how to recover in the right order.
Expired AS2 certificate in Boomi
What broke in Boomi AS2 Shared Server / Trading Partner components, and how to recover in the right order.
Expired AS2 certificate in IBM Sterling
What broke in IBM Sterling B2B Integrator / Sterling File Gateway, and how to recover in the right order.
Expired AS2 certificate in Mendelson
What broke in Mendelson AS2 / OFTP2, and how to recover in the right order.
Expired AS2 certificate in OpenText
What broke in OpenText Trading Grid / BizManager, and how to recover in the right order.
Expired AS2 certificate in SEEBURGER
What broke in SEEBURGER BIS, and how to recover in the right order.
Expired AS2 certificate in AWS Transfer Family
What broke in AWS Transfer Family (AS2), and how to recover in the right order.
Expired AS2 certificate in Babelway
What broke in Babelway / TrueCommerce, and how to recover in the right order.
how-to
Working with AS2 certificates
How to check an AS2 certificate's expiry date
Check when an AS2 signing, encryption or TLS certificate expires — paste it in the browser, or read it from the command line. No upload.
Convert an AS2 certificate between PEM and DER
AS2 partners sometimes need a certificate in PEM or DER format. Here's how to convert between them, and confirm the result is the same certificate.
How to get an AS2 certificate's fingerprint
The fastest way to confirm you and your AS2 partner hold the same certificate is to compare fingerprints. Here's how to read one.
What is an AS2 MDN, and why is it negative?
An AS2 MDN is the receipt your partner returns for a message. A negative or missing MDN often points at a certificate problem. Here's how to read it.