My Network Security Journal

Sharing my learning and personal experience in IT Network Security.

Saturday, April 11, 2026

FortiGate Manual HA Failover (Reset Uptime) Using CLI

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Here's a link in troubleshooting FortiGate HA. In my opinion, it's better to reset the FortiGate device uptime to manually restore ...
Sunday, March 15, 2026

Cisco Firepower SNMP OID Bug (CSCvd33367)

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We've been trying to poll our Cisco Firepower 2100 (ASA) and Cisco Secure 3100 (ASA) to monitor the device power supply, fan and tempera...
Sunday, February 1, 2026

Check the FortiGate NAT Session Count Using Filters

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Here's a quick way to check the FortiGate NAT session count and filter the NAT IP pool via the get sys session list | grep -c  CLI comma...
Saturday, January 3, 2026

FortiGate 1800F and How to Check Transceiver Serial Number

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Here's a Fortinet link for the FortiGate 1800F series data sheet. The FG-1800F front chassis has 1x RJ45 / USB CONSOLE port, 2x GigE RJ...
Friday, December 5, 2025

Configure Cisco SSH Diffie Hellman Size

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Here's a Cisco link  to improve SSH protocol in a Cisco device. One of our Cisco switch was flagged for using a weak SSH protocol. I har...
Friday, October 3, 2025

Configure SSH Key in Cisco Nexus Switch

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Here's a Cisco link  to properly configure SSH in a Cisco Nexus switch. The Nexus switch use a default 1024 bit SSH/RSA key. The correct...
Saturday, September 6, 2025

Disconnect SSH Session in Cisco ASA

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The Cisco ASA firewall supports up to 5 concurrent SSH login or users. I've received a report that some users couldn't login to the ...
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John Lloyd Lagura
I'm John Lloyd Lagura, a passionate Network Engineer, tech blogger and a lifelong learner. I specialize in routing, switching, security, wireless and cloud technologies. I currently hold CompTIA Network+, Security+, ITIL Foundation, Cisco CCNP Security, CCNP Enterprise, CCNA Cyber Ops, Juniper JNCIA-Junos, JNCIA-SEC, JNCIA-Design, Fortinet Network Security Professional (NSE4).
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