Syncml(504): The recipient, while acting as a gateway or proxy, did not receive a timely response from the upstream recipient ...

Syncml(504): The recipient, while acting as a gateway or proxy, did not receive a timely response from the upstream recipient specified by the URI (e.g. HTTP, FTP, LDAP) or some other auxiliary recipient (e.g. DNS) it needed to access in attempting to complete the request.
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