Zebra Technologies P1071336-002 Manuale Utente

SSL/TLS Certificate Errors

1/20/15

P1071336-002

Secure connections to the remote server present the opportunity for several errors when 
attempting to connect. The errors typically involve the certificates used when connecting via 
SSL or TLS. This section highlights some of the most common issues involving the 
certificates.

"SSL certificate problem: self 
signed certificate in certificate 
chain"

One of the situations that prevent a successful connection is not 
having the correct Certificate Authority certificates installed on 
the remote server. Zebra requires that the Zebra Root Certificate 
Authority and the Zebra Subordinate Certificate Authority be 
installed on the remote server. This error typically indicates that 
only one of the Zebra Certificate Authority certificates is 
installed on the remote server.

"SSL certificate problem: unable to 
get local issuer certificate"

One of the situations that prevent a successful connection is not 
having the correct Certificate Authority certificates installed on 
the remote server. Zebra requires that the Zebra Root Certificate 
Authority and the Zebra Subordinate Certificate Authority be 
installed on the remote server. This error typically indicates that 
neither of the Zebra Certificate Authority certificates are 
installed on the remote server.

"SSL certificate problem: 
certificate has expired"

This error indicates that the remote server’s certificate has 
expired. This is typically an indication that the printer’s date 
and/or time are incorrect as the Zebra certificates are typically 
issued for long durations. Check that 

rtc.date

 and 

rtc.time

 

are set correctly.

For printers that do not have a battery to store the 

Real Time Clock (RTC) value, the date will be restored 
to the default value upon a power cycle. The default 
value depends upon how the 

rtc.date

 SGD is managed. 

If it has never been set then it will default to the 
firmware build date (the value in 

appl.date

). 

Otherwise, the value in 

rtc.date 

will default to the 

value that it was last set to. This does not mean the value 
of the 

rtc.date

 when it was power cycled. It means that 

when a user sets 

rtc.date

 that becomes the new default 

value. 

If the printer has a battery, then the 

rtc.date

 is never 

default and continues to track the date as expected.