Error Message
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Possible Reason
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Resolution
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Service Unavailable (503)
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AS2 service is not enabled
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Enable AS2 service in Settings > Web > AS2
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AS2 HTTPS access not enabled for domain <domainname>. (503)
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AS2 service is not enabled for the specified domain
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Add an AS2 service for the domain in the Services module
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Invalid authorization credentials (401)
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Sender is not recognized as a valid trading partner
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Ensure that a valid trading partner is defined in the Trading Partners module. The trading partner must have an AS2 "To ID" that matches the AS2-From header of incoming AS2 messages
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Missing authorization credentials (400)
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Sender is not authenticating with a username/password
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Unauthenticated AS2 messages must be bound to a domain/username. See Settings > Web > AS2 > Inbound > Bind unauthenticated transfers to domain/user
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Signing key not present (500)
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Trading partner requires a signed receipt. Receipt signing key is not defined
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Enable the receipt signing key in Settings > Web > AS2 > Decryption & Signature
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Receipt signature verification certificate not found
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The signing certificate for the trading partner is not found
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Import a signing certificate for the trading partner in Keys > Host Keys
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Cannot overwrite existing file <filename> (500)
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AS2 is configured to disallow overwriting incoming files with the same name
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In Settings > Web > AS2 > Inbound, enable the "Overwrite | Generate unique file when existing file found" option
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Disposition modifier - error: insufficient-message-security
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Message was sent unencrypted and/or without a signature
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Disable encryption and/or signature requirements in Settings > Web > AS2 > Inbound, or request that the trading partner encrypt and/or sign messages
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