HP MFP Digital Sending Software 5.0 Manual do Utilizador descarregar pdf (Página 5)

If it is suspected that a port is blocked it can be very useful to use a network capture utility like

Wireshark to analyze network traffic. With the capture utility capturing packets at the DSS server,

initiate a job from the device and capture the traffic. If no packets are seen at the network interface that

originate from the device then the port is being blocked in the network infrastructure and not on the

DSS server itself. But, if the traffic is blocked on the DSS server then what will be seen is an initial packet

coming in from the device that is repeated every 3 seconds for about 30 seconds. This is because the

packet sent from the device to start a communication with the DSS service reaches the network

adaptor, but the firewall prevents it from getting to the DSS service so the service never acknowledges

the incoming packet. The device, not getting an acknowledgement, will retry every 3 seconds until it

gives up after 30 seconds.

Errors in Certificate Validation

This section applies only to FutureSmart devices. FutureSmart devices communicate with DSS using a

SSL/ TLS secure channel which requires an exchange of certificates between the device and the DSS

server. The certificate that the DSS server gives to the device is a self-signed certificate with a date range

that starts when the DSS instance was installed.

Starting in FutureSmart firmware from November 2014 the FutureSmart devices have server certificate

validation enabled by default. This means that when an external server gives the device a certificate for

SSL/TLS communication the device checks the certificate to make sure it is valid.

The most common certificate validation error we have seen is due to date checking. The DSS server’s

certificate has a valid start date from when DSS was installed and an end date way in the future (more

than 20 years). If the device has an incorrectly set date, one that is outside of the range for valid dates

for the DSS server’s certificate, then certificate validation will fail. When certificate validation fails the

device is unable to initiate communication with the DSS server.

The FutureSmart devices will log any certificate validation failures in the device’s event log. If jobs are

failing the manual bidi test should be run. If it fails, the event log of the device should be checked for

certificate validation errors. The error code to look for is 44.A0.A1.

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HP MFP Digital Sending Software 5.0 Manual do Utilizador Página 5