Articles about firewall | UserComp.com

Couldn't Manage firewall setup on Debian 12 using nft, ufw worked intended

In this tech support article, we will guide you through setting up a firewall on Debian 12 using nftables and ufw. While nftables is the new firewall management system, ufw is a user-friendly frontend for iptables and easier to use for beginners. In this article, we will cover how to install, configure, and manage firewalls using both nftables and ufw.

Connecting Kalilinux to Internal Network with Pfsense Firewall using VirtualBox: Troubleshooting Home Router Dashboard Issue

Learn how to connect Kalilinux to an internal network using Pfsense firewall in VirtualBox. Troubleshoot common issues like home router dashboard opening instead of Pfsense.

Creating a Bridge Firewall with DSA Switch: A Successful Attempt?

Learn how to create a bridge firewall using a DSA switch. Discover the steps to successfully configure this setup and secure your network.

WSL2 Loses Communication with Windows Firewall on Windows 11

Users running WSL2 on Windows 11 have reported that their WSL2 systems have lost communication with the Windows firewall. This issue is not related to DNS, and the WSL system continues to use the 172.22.32.1 DNS server gateway address. In this article, we will explore potential solutions to help restore communication between WSL2 and the Windows firewall.

Windows Firewall Blocking IIS FTP Connection - FTP Port Rules Enabled

Learn how to resolve issues with the Windows Firewall blocking IIS FTP connections by enabling FTP port rules.

Strange Reverse Proxy Behavior with Homebox and PFSense: A Tech Support Nightmare

A user describes experiencing strange reverse proxy behavior while using a Homebox and PFSense setup for their host servers. Ports 80 and 443 are forwarded via NAT translation, but the user is encountering issues. In this tech support article, we will explore possible causes and solutions to help the user resolve their reverse proxy woes.

IPv6 Firewall Rule: Allowing Public Access to Two Different Web Servers (Ports 80 and 443)

This article explains how to create a firewall rule in Unifi Security Gateway to allow public access to two different web servers using IPv6 protocol and ports 80 and 443.

Understanding the Impact of Disabling IDS on a DWR-M961 Firewall with Web Server HTTPS

In this tech support article, we will discuss the potential impact on security when disabling Intrusion Detection System (IDS) on a DWR-M961 Firewall with Web Server HTTPS enabled. While the web server remains active, understanding the implications of disabling IDS is crucial.

UFW Rule Not Followed for Docker: Troubleshooting and Solutions

This article explains the common UFW rule not followed issue when using Docker and provides solutions to troubleshoot and fix the problem.

UFW Firewall: Rules Not Working with VPN - Tech Support

Users report that their UFW firewall rules are not working when using a VPN. In this article, we'll discuss potential causes and solutions for this issue.

Troubleshooting NFTables: Unable to Catch Packets Already Seen on Dell S4810 Switch

This article discusses a common issue with NFTables on a Dell S4810 switch where packets are not being caught even though they have already been seen. Learn how to troubleshoot and resolve this issue.

Managing Outgoing Connections with Hostnames on macOS using Firewalls like Little Snitch

Learn how to manage outgoing network connections with hostnames on macOS using firewalls like Little Snitch for fine-grained control.

Setting up FIREWALL with DIPSEC (StrongSwan) for Site-to-Site Connection: Making PING work on Debian 12

This article explains how to set up a FIREWALL with DIPSEC using StrongSwan for a site-to-site connection between three nodes: edgerouter#1 (10.41.1.0/24), edgerouter#2 (10.48.2.0/24), and a VMS Debian 12 server. We will configure firewalld and make PING work between the nodes.

Setting up IPSEC (StrongSwan) Site-to-Site for PING to Work between Debian 12, Edgerouter #1, and Edgerouter #2

Learn how to set up IPSEC (StrongSwan) Site-to-Site for PING to work between a Debian 12 system and two Edgerouter devices (10.41.1.0/24 and 10.48.2.0/24).

Setting up IPSEC (StrongSwan) Site-to-Site on Debian 12: Making PING Work

Learn how to set up IPSEC Site-to-Site connections using StrongSwan on Debian 12 and make PING work between nodes.

OPNsense Hub Configuration for Blocking Communication between Two LANs

Learn how to configure OPNsense to block communication between two LANs, ensuring network security for different tenants.

Cloning Public Git Repositories for HPC Software Installation: A Firewall Consideration

During the installation process of scientific software packages on an HPC cluster, configuration often involves cloning several public Git repositories. However, firewall settings may hinder this process. This article discusses potential solutions.

Windows 11 23H2 Installation: Firewall Drops DHCP, Reaktek 2.5GbE 8125 Adapter Connection Issues

Users report issues with network connections during the installation of Windows 11 23H2, specifically with the Reaktek 2.5GbE 8125 Adapter. This article discusses potential causes, including Firewall drops, and offers solutions to help you successfully install the operating system.

Configuring Captive Portal with pfSense: Prevent Unauthorized Wi-Fi Users

Learn how to configure Captive Portal on pfSense to manage and secure Wi-Fi access for your network. Prevent unauthorized users from connecting and ensure secure browsing.

PFsense: Fake Subnet and IPsec Tunnel Mapping

Learn how to configure PFsense for IPsec tunnel mapping with a fake subnet. This article explains the process of setting up a remote network (172.x.x.x/24) with a local network (10.x.x.x.x/16), ensuring no changes to the remote configuration are necessary.

Configuring Firewall Logging: Correctly Setting Up Logging for SRV1 and SRV2

In this tech support article, we will guide you through the process of correctly configuring firewall logging for SRV1 and SRV2. Set up BIND logs on SRV1 to send logs to SRV2.

Configuring Firewall to Allow Docker Application Access to Virtual Machine

Learn how to configure firewall settings to allow Docker applications to be accessed from a virtual machine host system

LAN Machines: FTP Connection Blocked by Firewall Server 2019 - RRAS File Server Role

Users report that their FTP connections to LAN machines are being blocked by a Windows Firewall Server 2019. Disabling the firewall temporarily resolves the issue. However, the servers in question have the RRAS file server role. This article explores the possible exceptions and configurations required to allow FTP connections while keeping the security of the network.

Using IPFW with Timed Rules: A Tech Support Guide

This tech support article aims to help users understand how to use IPFW (Internet Protocol Firewall) with timed rules. If you're having trouble activating rules in the desired order or verifying their effects, this guide may provide the answers you're looking for.

Unblocking Port 80443 for IIS Web Server

Learn how to open Port 80443 for IIS web server on a Windows PC. This step-by-step guide covers forwarding ports and configuring firewalls.

IPFW Log: Understanding iPFW Correspondence and pf PFCommands

In this tech support article, we will discuss the correspondence between IPFW and pf commands, and how to interpret the IPFW log for these correspondences.

How to Remove a Specific Access Denied Rule in Hyper-V Firewall for WSL2 Instances

Learn how to remove a specific Access Denied rule in Hyper-V Firewall for WSL2 instances. Follow these steps to create and remove the rule.

Successfully Deploying OpenVPN with pfSense Firewall Behind Starlink Dish

This article explains the process of successfully deploying OpenVPN with a pfSense firewall behind a Starlink dish. The connection between the Netgate pfSense firewall and the Starlink dish has been established, and both WAN and LAN are running smoothly. Port 1 WAN (192.168.xxx.x) has been configured. Learn how to configure OpenVPN with pfSense and Starlink.

Bypassing GEOIP Protection with VPN: A Web Application Firewall Issue

A user reports that their web application firewall, which has GEOIP protection enabled, allows traffic within a Canadian site, but Google Analytics shows connections originating from Asia. This issue might be due to VPN usage. In this article, we'll discuss possible solutions to bypass GEOIP protection and ensure accurate geolocation data.

Ubuntu 22.4.4 LTS: UFW Firewall Allows SSH but Prevents Connection to Another Server

A user reports an issue where Ubuntu 22.4.4 LTS uses UFW firewall, allows SSH connections, but prevents connecting to another server. This article provides suggestions to troubleshoot and resolve the problem.

Firewalling Docker Compose on Debian 12: Accessing Containers Behind a Firewall

Learn how to configure firewall rules to access Docker Compose containers behind a firewall on Debian 12. This article explains the necessary steps to set up host networking and adjust firewall settings for successful container access.

Understanding the Use of I Option in Traceroute Command with Netfilter Firewall

In this tech support article, we will discuss the use of the I option in the traceroute command when dealing with a Netfilter firewall. Two different packages have been tested to provide a clear understanding of this concept.

Adding Custom UFW Rules: ufw limit --hit-count custom value

This article explains how to add custom UFW rules by writing them in /etc/ufw/before.rules (or after.rules). It covers the process of reloading UFW and transferring existing rules, as well as providing an example of a custom limit rule.

Iptables Not Dropping UDP Packets with Exact IP Address

This article explains why iptables may not be dropping UDP packets with exact IP addresses and provides solutions to resolve this issue.

Configuring PFsense as a Firewall for Network Traffic on a Ubuntu VM with an ATT Modem WiFi6 Router

Learn how to configure PFsense as a firewall for network traffic on a Ubuntu VM with an ATT Modem WiFi6 router.

Traffic Not Passing OPNsense Firewall in Hyper-V: Troubleshooting Steps

Experiencing issues with traffic not passing through OPNsense firewall in Hyper-V? Follow these steps to troubleshoot and resolve the problem.

Connecting Verizon FiOS ONT to Netgate 8200 pfSense Firewall with 10G via SFP+: Intel SOC Limitations

Users encountering issues connecting their Verizon FiOS ONT to a Netgate 8200 pfSense firewall using 10G via SFP+ and experiencing Intel SOC limitations. This article provides solutions and suggestions.

Windows Firewall WS2016 Won't Accept IPv6 Loopback IP

Users report issues setting IPv6 loopback addresses in inbound rules of the Windows Firewall on Windows Server 2016. This article explains the error and provides a solution.

Switching from Bridge Networking to Setup Software: A Ubuntu 22.04 LTS Guide

Learn how to switch from bridge networking to setting up software on Ubuntu 22.04 LTS for your DIY router. This step-by-step guide covers installing firewalld and configuring different ports for Mxd.

Isolating a Ubuntu Desktop VM using VBox and Endian Firewall

Learn how to isolate an Ubuntu Desktop VM using VirtualBox and Endian Firewall, allowing internet access.

Setting Up a Private LAN Network within Another Network (Linux) using Open-Source Firewall Software

Learn how to set up a private LAN network within another network using open-source firewall software on Linux. In this scenario, we will use a desktop computer.

Configuring UFW Firewall with Mastodonbot on Raspberry Pi

Learn how to configure UFW firewall on Raspberry Pi to securely run Mastodonbot, a Mastodon instance in a local network.

Configuring SNMP on SonicFirewall with Ninja One

Learn how to configure SNMP on SonicFirewall using Ninja One, the SolarWinds tool. Follow these steps to set up SNMP and monitor your network.

Tech Support: Not Reaching Domain via HTTPS Server Behind PfSense Firewall

When hosting multiple domain names on a server with a Spring Boot backend and an HTTPS server behind a PfSense firewall, some domains may become unreachable. This article explains how to troubleshoot and resolve the issue.

Understanding the Default Verdict with nftables Rule: A Comprehensive Guide

This article provides an in-depth explanation of the default verdict in nftables rules. Learn how to configure and manage the default verdict to enhance network security and performance. A must-read for Linux system administrators and network engineers. Read more for a comprehensive guide.

Configuring Murus Firewall on MacOS: Allow Connection to Modem Dashboard

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