Questions tagged [firewall]

Software that controls what connections can be made to and from a network.

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Could in-place upgrade of Server 2012 to 2019 affect firewall rules or IIS sites?

An application I support has been installed on Windows Server 2012. The server is to be upgraded to Server 2019 in an in-place upgrade. This is to be done without being tested first. The application ...
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RDP credential were use to connect did not work, please enter new credential [closed]

Last 2 weeks i have been facing remote desktop connection problem. I am new in AWS. A few day back, I had received an account suspension mail because of payment due. I made all the payment done. Now i ...
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Synology NAS not accessible remotely after move. Possible firewall issue?

I am a remote administrator for a client who recently moved physical office locations. I'm having an issue with reconnecting back into the Synology NAS that they use for file store. From what they've ...
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pfsense - slow connection to internet from wired network but not from wireless/wifi

summary: internet speed tests indicate that the connection to the internet from my wired network is very slow, while speed tests from a device on my wifi network gets the expected (much faster) result....
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Where are Windows 7 Firewall custom rules stored?

First of all, I know about the existing answers to the question. They mentioned three places in the system registry: HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\WindowsFirewall ...\SYSTEM\...
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Why can't I RDP into my devices behind my router with my wireguard tunnel up

My network setup was working, until I realized that my understanding of the firewall requirements for this assignment (class project) were off and need to alter things. With my new configuration of ...
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autapf port forwarding tool - UDP port forwarding

We're using NetworkActiv AUTAPF 2.2.6 tool on Windows 11 PC to setup a TFTP server on windows PC. The configuration are as follows: We're seeing timeout errors on our system with this setup as ...
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IPtables does'nt apply this rule

I got many rules like this : #!/bin/sh modprobe ip_conntrack # Initialiser les tables iptables -t filter -F #Vider les règles custom iptables -t filter -X #Interdire toutes les connexions entrante ...
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Proper path for client's "Local Group Policy" in PS' NetSecurity module

So, by default default, Windows client OSes (and servers too, to a degree) have 2 default Windows Firewall policies: weird local firewall and local group policy. In netsh you can easily switch between ...
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Debian with VPN and firewall blocking web traffic

I have a VPN (IKEv2) set up on a Debian VM. I'm trying create a kill switch to stop all traffic when the VPN goes down. I've followed the guidance of this post. It seems to work fairly well (torrent ...
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Computer not pinging from the internet

I am trying to set up DDNS for my machine and it works for the most part. And, I would like to remotely ping to the machine. Now, the DDNS is configured properly and it is taking the IP refresh ...
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Send custom/malformed DNS request

The CTF is over now, but there was a CTF called NahamCon (link) that I was playing earlier. There was a challenge that I was certainly interested in but didn't know how to do: screenshot I understood ...
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Windows Cloud PC Cannot change Windows Defender Firewall default behaviour for outbound connections

I'm trying to set the properties of Windows Firewall to Block outbound connections via Windows Defender Firewall with Advanced Security. This machine is a Windows Cloud PC that is provisioned with ...
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Terrible Windows iperf performance

I'm having a weird issue that's totally stumping me. The performance of 10G ethernet on my Windows computer is poor in the incoming direction from one computer, and exceptionally poor from another. ...
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Need to run determine whether I can reach FTP server, through firewall?

I have an ftp server on a cloud VPS instance. The IP can be obtained from a domain like myvps.example.com. I would need to run a powershell script across a variety of computers that are sitting behind ...
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Can my vps provider see that I'm using a vpn service on my vps?

If so can I know, how do they do it? I contacted the CS and they said that they use something like NextGen firewall and AI to detect these actions. I want to know more about this but cant seem to find ...
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Should iptables block RST packets for a websocket connection?

I have the following setup for offloading SSL and running home assistant : Raspberry pi A (model 3, 10.0.0.21 below) is running apache2, NextCloud and iptables. Raspberry pi B (model 1, 10.0.0.69 ...
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SMB2 port range? Port 64663?

I'm copying files via the program Bvckup to a windows share. From a wireshark capture, I see that the operation uses TCP port 445 and SMB2 port 64663. I want to make a firewall rule, but I am ...
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Is it possible to restrict client-to-client communication on a switch?

I have a linux machine acting as a router with a wifi interface (hostapd) and multiple ethernet interfaces bridged together. I want to add multiple smart home devices to the network. What I am trying ...
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I cant open port on my router to make my computer app public

I use windows10 I already open port on my router admin page (Advanced Port Forwarding). Windows firewall Disabled Even if i setup DMZ Address for my LAN 192.168.0.12 my public address not works. I ...
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iptables v1.8.7 (legacy): unknown option "--to-ports"

I am trying in libreelec, that all traffic is redirected to a docker with tor and privoxy, the problem that when entering the iptables rule returns "iptables v1.8.7 (legacy): unknown option "...
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FortiGuard firewall strange behavior/trying to bypass

(Excuse me for the non-technical terms, my Knowledge isn't the Greatest) Context: I'm an engineering student and I stay in the dormitory of my university Lets just say that the network isn't the ...
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Can't clone a remote repo when ufw is enabled

I have a cloud VM running alpine3.15 [disk mode enabled] and I am able to clone/push/pull to github when ufw is off. However when it is on, all git commands that talk to github get stuck (no output) I ...
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Ansible UFW allow outgoing, deny incoming

try to roll out UFW via Ansible. - name: Install UFW Firwall hosts: all tasks: - name: UFW enabled community.general.ufw: state: "enabled" policy: "deny&...
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Does DNS over HTTPS work in China?

DNS over HTTPS is a new technology that encrypts your DNS lookups, so that your ISP cannot see what domain names you are trying to visit. Firefox enabled it by default for me yesterday. I would like ...
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Strange issue with downloading from Google servers

Really strange that i'm not sure how to explain. I've been experiencing this for a really long time but mostly didn't cared or tried another ways but now i really want to solve this. I'm using Firefox ...
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How do I configure the firwall to open all ports to a certain zone?

I created a virtual machine via qemu/kvm on my machine. The NIC name of this virtual machine is virbr0, and it is managed by the libvirt area of the firewall: $ sudo firewall-cmd --zone=libvirt --list-...
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What's the point of a default gateway?

Maybe there's something I'm misunderstanding fundamentally, but this just isn't clicking. I deal with networks that look like (Router > Firewall > Switch > Hosts) with a few port forwarding ...
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Add a IP to another rule matching hex in iptables linux

iptables -t raw -A PREROUTING -p udp --dport 4578 -m string --hex-string '|fefffffffffffffffff77f12|' How can I whitelist the IP having the above hexx string automatically on Iptables. I'll be ...
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Port forwarding and IPv6

I have a basic small server that I run on my own computer, which I can access like this: localhost:3000 However I would also like to access the server from outside my home, for example using my phone ...
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UDP packets dropped with `ctstate=INVALID`, but meanwhile its connection `[ASSURED]` in conntrack list

I have my router connecting to a remote VPS as so-called 'VPN' that is based on UDP protocol, then the VPS traffic slows down in few seconds after a new reboot. I can see a huge amount of incoming ...
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Nftables firewall rule hex value 0x1fff changed to decimal 8191

I started the process of migrating into nftables, just noticed that while I add this rule add rule netdev filter INGRESS ip frag-off & 0x1fff != 0 counter drop should look like this in nftables....
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iptables firewall whitelisting limit

We have a distributed system with many clients connecting to this system. We want the server to be isolated so that only client machines can connect. We are using IPTables as follow: /sbin/iptables -A ...
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allow firewall after first time disallow

I'm using win10 with UAC enabled, typically this is my working laptop so cannot disable UAC. When download a exe or jar, try to execute it, sometimes windows firewall will prompt whether allow or not ...
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Relay TCP upload traffic and make download traffic go directly to the client

This is a supplement for iptables SNAT for UDP rule is only applied to some traffic In fact, I have three machines: the client the target server the relay server What's my motivation for doing this? ...
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iptables SNAT for UDP rule is only applied to some traffic

I want to use Source NAT to change the local IP address of UDP traffic. However, only locally-generated traffic has the NAT rule applied, replies to traffic generated from remote sources do not have ...
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How do I remotely connect to my home network which is behind a firewall that is connected to a VPN provider?

I apologize if this is a duplicate question, feel free to direct me to an existing answer. I don't know the terminology so I don't think I recognize the answer if it's out there. I'd like to be able ...
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How can I check if firewall is blocking ping from machine belonging to a specific subnet on Linux CentOS7?

I am not a system engineer (I am a software developer) and I have the following problem. I have this Linux CentOS 7 server. A collegue told me that he can't ping this server from some specific machine ...
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How do you configure firewall to map ports outside to a device inside lan?

Using TPLink omada sdn controller, I wanna map remote desktop connection 3389 on my home computer (uses a fixed IP address) to port 4000 on the WAN interface... Cant seem to figure out how to do this
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Enable access to host service with ubuntu firewall from docker container

I have a service running on a host at port 8545. I have several docker containers which need access to this service on the host. The host is running ubuntu. I've successfully configured extra_hosts: - ...
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2 votes
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Bridge-Mode to prevent double NAT/Firewall advantages?

In my network I currently have a cable connection with an ISP provided (consumer grade) modem/router combo device. Behind this modem there is a pfSense box. The pfSense box is acting as firewall and ...
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What is the correct term for "secondary IP addresses" handled by a firewall's primary interface?

I have an aging and now-unsupported "ProSAFE" VPN firewall running defense around a /28 block of public IP addresses leased to us by our datacenter. Our WAN drop is a single ethernet cable. ...
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Allowing ICMP (ping) incoming packets in Windows 11 firewall

I noticed Windows 11 doesn't let ICMP packets through by default. The network needs to be assigned to a non public network and the appropriate firewall rules have to be activated. I found the ...
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Using host & iptables as bastion before mongoDB

I am trying to setup a config on a "bastion/NAT" host. I have 2 mongoDB host, which are behind firewall, my bastion and a set of clients. my bastion has main IP: 10.198.24.10 and 2 aliases: ...
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OPNsense system to replace Router

I'm planning on building a system to replace my current router and want to use OPNsense. This will work right? Ask because it says firewall on website but also routing, so must be a router. Hardware: ...
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How do I filter inbound/outbound traffic based on words?

I need to filter some outbound requests to certain sites based on the request headers and post data. I might be interested in filtering inbound packets as well. They are in plain text (ie not https). ...
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How do you properly allow two devices on separate subnets to communicate (PFSense)?

I'm trying to figure out how to get 192.168.0.22 to properly ping/be able to transfer files with 192.168.77.10. Firstly, is this a dumb setup? I'm mainly using it right now just for educational ...
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Command Prompt to Enable ports in Windows Firewall

I was experimenting and was not able to find an way to enable rules/ports under Inbound Rules in Windows Firewall. Every thing I've tried so far only shows or creates something new such as this netsh ...
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How can Windows Firewall be used to further increase security in Windows 10, would it be by blocking particular ports?

How can Windows Firewall be used beyond it being turned on, to increase security of a Windows 10 Home PC, would it be best to use the firewall to block these ports? I would like it to be as secure as ...
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Mikrotik setup firewall rules for NAT

I read through similar questions here but I did not find the right answer. I've just bought a Mikrotik hap ac2 router to learn its configuration, and tried to set up NAT. It seems to be working ...
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