Questions tagged [firewall]

A Firewall is an application or hardware device used to inspect and filter network traffic.

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Why UFW port range / number for ports is limited to 15 ports? [closed]

Why UFW port range / number of ports is limited to 15 ports? man ufw: You cannot specify more than 15 ports
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IPsec client access to LAN of other client

Since my home network is behing double NAT I want to set up a "reverse VPN" from a VPS that gives me access to local LAN from other VPN clients. I have set up a Strongswan IPsec server on ...
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Windows Remote Desktop connection attempts not blocked by host firewall

I own a Windows Server 2012 VPS hosted by OVH. Noticing several failed RDP connection attempts (brute force attacks), I turned on the host's firewall, blocking all connections aside from 4 IP ...
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Azure Virtual Machine Firewall

I have multiple virtual networks, a VPN VN with site-to-site VPN, an AADDS VN, a production website cluster of virtual machines on a VN and a test website cluster of virtual machines on a VN. I also ...
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How to block Filetransfer through RDP (Port 3389)?

For security reasons I have to restrict/disable file transfer via RDP (port 3389) from and to Remote Machines (Windows 10). Is the file transfer tunneled through port 3389, or can I safely prevent a ...
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Is allowing all packets on INPUT and OUTPUT on lan interface secure on a gateway router (iptables)

My main gateway router (Also the DHCP and DNS server for my LAN) lets me ssh in and configure iptables. Seeing as almost daily I'm making it provide more services like NTP, DNS, FTP e.c.t, I want to ...
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Can't reach home network from outside [closed]

I'm not sure if this is the best place to ask this question, but i figured i might aswell do it anyway, i have been trying about anything i could think of and had no success. As the title states i'm ...
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37 views

Kubernetes through Virtualbox; Pods can't access internet services

System: VirtualBox, Debian 10 Server, Kubernetes with kubeadm I've setup a deployment and a service and I am exposing it via NodePort but my Pods somehow cant access the internet. The worker node ...
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ufw of my server blocks all traffic after going through online VPN config tutorial

I followed this tutorial https://www.digitalocean.com/community/tutorials/how-to-set-up-an-openvpn-server-on-ubuntu-18-04#step-5-%E2%80%94-configuring-the-openvpn-service I have finished all the steps ...
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1answer
31 views

Web Site pings different ip depending on if I ping from server or local machine

I have a web app hosted on a server that was recently moved to a new location and has a new ip address associated with it. I am not well versed in networking or server administration so any help is ...
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91 views

wireguard “destination address required” when trying to communicate from client-to-client rather than client-to-server

I have a simple wireguard network comprised of a single "server" (the only device with an externally routable ip address) and two clients. Communication between the server and the clients ...
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Port Forwarding - Reverse SSH - Source IP

Scenario : I have to host a Webserver/SSH server at "Server B" which is without public IP, I purchased a VPS "Server A" with a public IP and I am doing reverse SSH port forwarding ...
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Server-side Apache firewall questions. Getting pwned (maybe) with Cloudflare DDOS Protection turned on, cowboy coding gone wrong

So, for the past few months I’ve been working on a portfolio WordPress Site. I host and operate this website myself on an Apache2 Server, regular lamp stack. Due to the fact that I am cowboy coding ...
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1answer
31 views

Block ICMP to source IP

I am trying to block ICMP to an incoming subnet, lets say this is 1.0.0.0/24 I am currently using Linux (Ubuntu 20.04) with a basic ufw setup. Right now people can ping an address like 1.0.0.0, how ...
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Should RELATED connections always be allowed in iptables, ip6tables, nftables etc?

In all examples of configuring Linux firewall rules, I see that it is necessary to allow connections which state is RELATED. nftables (link: https://wiki.nftables.org/wiki-nftables/index.php/...

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