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Test Your AS2 Connection Online, Free

Run a real, free endpoint check right here, no signup: DNS, TCP, TLS, certificate, and HTTP response, graded A to F. The full 8-point diagnostic with encryption, signing, and the MDN round trip comes with a free account.

This free check runs live against your endpoint. No signup needed. Create a free account to run the full test with encryption, signing, and the MDN round trip.

What the graded report looks like

GRADE B+

Sample report

Warning: Key Size 1024-bit

Remediation: Key size too small for partner compliance. Recommend 2048-bit RSA or ECDSA.

Success: TLS Handshake

Negotiated TLS 1.3 with AES-256-GCM.

How do you test an AS2 connection?

Four steps. No install, no signup, no partner coordination call.

  1. Enter your partner's AS2 endpoint URL

    Paste the HTTPS URL where your trading partner receives AS2 messages. This is the URL from their connection spec, not their website.

  2. Add the partner AS2 ID

    Optional, but it tightens the identity checks. Ask your partner for the exact AS2 ID string. Case and whitespace matter.

  3. Run the free check

    The free check runs live against your endpoint right here: DNS, TCP, TLS handshake, certificate validity, and HTTP response. The full test, included with a free account, also sends a signed and encrypted test message and requests a signed MDN receipt back.

  4. Read the graded report

    Each check shows pass, warn, or fail with the exact fix. Grade A means the connection is production ready. Anything lower tells you what to change first.

What does the AS2 connection test check?

Five checks cover the failure points that burn onboarding days. Each one reports the exact value it saw, not just pass or fail.

  • TLS handshake

    Confirms the endpoint accepts a modern TLS connection and reports the negotiated protocol version and cipher. Old TLS 1.0 endpoints get flagged here.

    See the full testing guide

  • Certificate validity

    Checks expiration, key size, and the trust chain. A missing intermediate CA fails partner validation even when the cert itself looks fine.

    Read the AS2 certificate guide

  • Encryption

    Verifies the payload encrypts with an algorithm your partner accepts. 3DES still shows up in the wild; the report tells you if it should not.

    Check your certificate separately

  • Signing

    Confirms the message signature verifies and flags algorithm mismatches, like your SHA-1 signature against a partner that requires SHA-256.

    See signing certificate requirements

  • MDN round trip

    Waits for the signed MDN receipt and verifies it. Most AS2 support tickets are MDN failures, and this check names the cause instead of guessing.

    Debug MDN failures step by step

Can you test AS2 without your trading partner?

Yes. That is the point of the hosted sandbox. Most AS2 tools make you wait until your partner has configured their side, so every mistake costs a round of emails and days of calendar time.

Run your test against the AS2 Certify sandbox endpoint instead, included with a free account. It behaves like a real trading partner: it validates your certificate, decrypts your payload, verifies your signature, and returns a signed MDN. Fix everything on your side first. Then the test against the real partner becomes a formality.

A single failed onboarding burns around 40 engineer hours. Testing against the sandbox before the partner call is how you avoid that bill. Full walkthrough: how to test an AS2 connection without a partner.

Frequently asked questions

Is this AS2 test free?

Yes. The endpoint check on this page runs live against your URL with no signup and no credit card: DNS, TCP, TLS, certificate, and HTTP response, graded A to F. A free account adds the full round-trip test with encryption, signing, and the MDN receipt. Paid plans add scheduled monitoring, historical reports, and shareable compliance evidence.

Do I need my trading partner online to test?

No. Point the test at the AS2 Certify hosted sandbox and validate your certificates, encryption, and signing before your partner is ready. When their endpoint goes live, rerun the same test against it.

What does the A-F grade mean?

The grade is a weighted score across all checks. A means production ready. B means minor warnings, like a certificate expiring soon. C or lower means at least one failing check that will break message exchange.

How long does an AS2 connection test take?

About 60 seconds for a responsive endpoint. The full run, including the MDN round trip, finishes in minutes even when the partner server is slow.