BGS5T SSL Issue | Telit Cinterion IoT Developer Community

Hi,

We are using a BGS5T modem in one of our products that interfaces our hardware to one of our customers' servers via REST (HTTPS).

The modem operated faultlessly, however, the customer modified their SSL certificate authority and now the modem generates the following errors when initiating a GET (HTTPS) to an endpoint on the customers' server:

INT:-213 SSL-Error: revcd alert fatal error

or

^SIS: 1,0,210,"INT:;IOError -123 during socket:: write \0a"

The endpoint is generally accessible via other means, e.g. Postman, but the BGS5T falls over.

A trace of the AT commands used and associated responses is shown below.

Is there anything that can be understood from the errors that might help indicate what the issue is on the CA side?

Thanks in advance.

Jim.

******************************************

AT+CREG?

+CREG: 0,5

AT^SICS=0,conType,"GPRS0"
OK 

AT^SICS=0,"inactTO", "240"

OK 
AT^SICS=0,user,"USER"

OK 
AT^SICS=0,passwd,*******

OK 
AT^SICS=0,apn,"iot.1nce.net"

OK 
AT^SISS=1,"srvType","HTTP"

OK 
AT^SISS=1,conId,0

OK 
at^SISS=1,"hcProp","x-token: ********************************"

OK 
at^siss=1,hcRedir,0

OK 
AT^SISS=1,cmd,"get"

OK 
at^siss=1,"address",https://*********************************"

OK 
AT^SISO=1

OK

^SIS: 1,0,2200,"Http polysync.water.kisters.cloud:443"

^SIS: 1,0,210,"INT:-213 SSL-Error: revcd alert fatal error"

or alternatively--->

^SIS: 1,0,2200,"Http polysync.water.kisters.cloud:443"

^SIS: 1,0,210,"INT:;IOError -123 during socket:: write \0a"