Hello Jasin,
Thank you for your feedback.
Regarding the error SNMP -2003, it indicates that the probe has not receive any response from the target device. Therefore, can you please check that SNMP is activated on the corresponding interface in your firewall under Administration > Device access as illustrated below:
I also invite you to make sure that the SNMP agent is enabled on your firewall and that PRTG is able to execute query against it (under Administration > SNMP), as illustrated below:
Finally, the SNMP settings (port and community) must be the same as the one defined in the device settings in PRTG, under Credentials for SNMP devices.
Afterwards, PRTG should be able to communicate with the firewall via SNMP. If you still encounter the issue, then I invite you to check if there is a rule blocking the traffic on the corresponding port.
Regards.
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