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Questions tagged [firewall]

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

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Mullvad VPN running on VPS causes issues with Remote Desktop connections

I want Mullvad VPN to run on my Windows VPS. However, the moment I enable Mullvad I can no longer connect to my VPS via Remote Desktop, it simply does not connect. Some further requirements: I don't ...
Adam's user avatar
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-1 votes
1 answer
52 views

How to git clone a public repository through firewall?

I am trying to install a scientific software package on a HPC cluster. Let's call it clusterhpc. During the configuration process software package tries to clone a bunch of public git repos. However, ...
mechanics32's user avatar
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15 views

VM Virtualbox: can only login on VPN client on VM when VM's firewall is off. How to add an exception to the VM's FIrewall?

I need a Windows OS for work in which I have full control. I have a computer with Ubuntu and from there I am running a Windows 10 VM through Oracle's VM VirtualBox. My work requires me to use a VPN ...
Stefan Verweij's user avatar
1 vote
0 answers
40 views

Firewall drops DHCP with full allowed or disabled Firewall in Fresh unchanged Windows 11 23H2 Installation

I installed a fresh Win 11 23H2 (with lot problems caused to broken Installer-PE, but not the point) The Network Connection dont work. Its a Reaktek 2,5GbE 8125 Adapter. I tried: diffent settings like ...
kamikaze ghost's user avatar
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16 views

Problems with Captive Portal on pfSense

I need help configuring the Captive Portal on the pfSense Firewall. What I need? I need to put Captive Portal on some access points to prevent users from using Wi-Fi. I've already tried to create a ...
Thiago Canato de Azevedo's user avatar
1 vote
0 answers
21 views

Is there anyway to disallow accessing local network devices through global IPv6 addresses in linux?

I realize that this question might sound kind of strange, but it is necessary for my situation as far as I can tell. The root of it is that my ISP assigns IPv6 global addresses dynamically and ...
Nik Tedig's user avatar
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How to set up IPv6 NAT in libvirt open forwarding mode?

libvirt can do IPv6 NAT by itself in NAT forwarding mode if you give it the ipv6='yes' attribute. But that adds a bunch of firewall rules and I don't want it mucking up my already existing firewall ...
Nik Tedig's user avatar
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Azure VM private IP is used for outbound access through Azure APIs instead of NAT Gateaway IP

so I have a VM (it has a NIC with a public IP for inbound traffic so I can SSH into it) within a subnet, that subnet has a Nat Gateway with a static public IP attached to it, and that static public IP ...
Baha Abrougui's user avatar
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1 answer
72 views

How to resolve an asymmetric routing issue?

I have a network consisting of the following: PfSense router with untagged network 10.1.0.0/23 and tagged VLAN 40 network of 10.1.40.0/24. I have a wireless computer connected to the the 10.1.0.0 ...
KevDog's user avatar
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FTP Server can be accessed locally but not from other networks

I have set up an FTP server from microsoft IIS to communicate with some 4G cameras that I have placed in the field (that support FTP). Right now I am testing this server to troubleshoot why it doesn't ...
Stratos Kakalis's user avatar
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Not able to access any external FTP server from machines in LAN when Windows Firewall is ON on server 2019 as router [duplicate]

From server itself I can connect. From LAN machines connection to any ftp blocked. If I disable firewall on server - all worked. Server has two roles RRAS and file server. Other connections except FTP ...
Elm Elm's user avatar
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1 answer
34 views

Using ipfw and pf together

I would like to use pf and ipfw at the same time for different tasks, but I can not understand who is activated first (if there is an order) when a rule is received. Also trying to verify this, I can’...
usernew's user avatar
2 votes
0 answers
42 views

Connection abruptly terminated by remote host when trying to gain ssh access to a windows computer from outside the local network

I have a windows computer and would like to gain ssh access to its powershell from outside my home network. For this purpose, I opened a TCP port on the router and set up automatic forwarding to the ...
Yes's user avatar
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1 vote
1 answer
82 views

Is it possible to temporarily block internet connection to a specific program? preferably with a keyboard hotkey

I was wondering if there is any third-party application that would make it possible for me to temporarily sever internet connection to a specified application? My hope is to use a key bind for this ...
Massenj's user avatar
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1 answer
117 views

How to stop ufw-firewall preventing me to ssh into another server?

I have a weird issue on Ubuntu 22.4.4 LTS. Using the ufw firewall, I allowed SSH/Port 22, HTTP and HTTPS. I can successfully login via SSH into my server. However, when I am logged in on the server, ...
itinance's user avatar
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55 views

Firewalling Docker Compose

I'm trying to operate Docker Compose containers behind a firewall on Debian 12. I cannot get access to the host machine (set up to be host.docker.local in the containers) to work within the containers ...
Timothy R. Butler's user avatar
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0 answers
21 views

I cant set up two different network categories for two independent network interfaces on windows 11

I have to set two different network categories public and private to two different lan adapters. There are multiple firewall rules that open ports that only shall apply to the LAN. Whenever I execute ...
raptorlane's user avatar
0 votes
1 answer
43 views

Unable to connect to certain servers

I've been having a recurring problem where I'm unable to connect to certain servers. For example: I'm able to make Google searches, but unable to visit any of the links. Or I'm able to play a game, ...
User's user avatar
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1 answer
100 views

Allowing incoming ICMP from only a specified source IP

In the predetermined snippet: netsh advfirewall firewall add rule name="ICMP Allow incoming V4 echo request" protocol=icmpv4:8,any dir=in action=allow What would I change exactly to allow ...
James Smith's user avatar
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3 answers
78 views

iptables not dropping udp port for exact ip address

My iptables rules are as follows: -P INPUT ACCEPT -P FORWARD ACCEPT -P OUTPUT ACCEPT -N f2b -A INPUT -p tcp -m multiport --dports 80,443 -j f2b -A INPUT -d (my public facing ip)/32 -p udp -m udp --...
user9503's user avatar
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0 answers
58 views

Block MQTT port from windows firewall

I want to block any MQTT transaction from my laptop. I am using port 8883 as mqtt port as i am using TLS. I tried to change the firewall outbound rules and added a new rule to block the connection for ...
Devjeet Mandal's user avatar
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0 answers
289 views

New Teams Windows Firewall Rules

I genuinely think I'm going crazy with this, does anybody know how to allow any version of the new Microsoft Teams through the Windows Firewall. If it installs an update, a new location within "...
Admaine's user avatar
0 votes
1 answer
79 views

Block with firewall a dns request containing a certain query

Example let's say I'm with iptables or nftables I want to allow a certain traffic like the following one: iptables -A OUTPUT -d 192.168.1.1 -p udp --dport 53 -j ACCEPT iptables -A INPUT -s 192.168.1.1 ...
user3450548's user avatar
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0 answers
30 views

How to configure a PC running pfsense to act as firewall for all network traffic

I am trying to set up PFsense in my network as a firewall between my modem (ATT modem and my WiFi 6 router). The setup I'm using is a PC with Ubuntu and VMware running PFsense. I have two network ...
Vincent Cooke's user avatar
1 vote
0 answers
37 views

Why is traffic not passing through OPNsense firewall in Hyper V?

I'm configuring OPNsense in Hyper-V. It is connected to the DMZ on one interface, and the internal network on the other, with internal switches for the VMs. There are VLANs setup and working fine. The ...
Daniel's user avatar
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0 votes
0 answers
154 views

To allow IPsec NAT-T traffic to pass through, why does the firewall still need to permit ESP when it already allows UDP 4500?

I established an IPsec VPN tunnel between two Juniper SRX routers across NAT, with the NAT being performed by the firewall (a Linux server). When attempting to configure the firewall rules to allow ...
phoebe61g's user avatar
0 votes
1 answer
55 views

Options for Connecting Verizon ONT via 10G CAT6a to Firewall's SFP+ with Intel SoC Limited Compatibility?

Reposting here after visiting Verizon Forums & Netgate Forums... I have FiOS and the provided ONT outputs 10G via RJ45 Ethernet. I purchased a Netgate 8200 pfSense+ firewall/router appliance. I'm ...
ZoshMan's user avatar
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0 answers
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Ncat inside WSL2 not behaving correctly

I have an instance of kali linux running in WSL2 on Windows 11. It is configured to use mirrored networking mode, if that is relevant. Typically, if one were to start listening on 127.0.0.1 on any ...
JavaNoob's user avatar
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1 answer
39 views

How can I block GPSD from communicating out?

I have two computers; one running gpsd and one using gpspipe -w 192.168.90.1 to query the data. GPSD listens on port 2947 and I want to block it with iptables. I've tried so many rules, but I can ...
Raven's user avatar
  • 209
0 votes
1 answer
90 views

How to protect tftp server on pc?

I run ubuntu, and I've installed tftp-hpa on my system. I've read that I need to secure my network when I have tftp. Here what I'm talking about and I would like to know the steps to do what they ...
James78's user avatar
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0 votes
0 answers
141 views

HTTP tunnel proxy solutions to escape corporate proxy & firewall

I have a system in a corporate network with a very restrive firewall: no SSH only direct traffic allowed is to the corporate HTTP proxy server (80/443) Deep Packet Inspection I would like to setup a ...
knarf's user avatar
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0 votes
0 answers
21 views

PFSense: Subnet can not communicate to the outside

I have multiple subnets on a hypervisor with four Ethernet ports. Two are called subnets. Both of them are utilizing a NordVPN tunnel as their default gateway. The first subnet LAN can talk to ...
daniellooartist's user avatar
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0 answers
33 views

Can Multiple Devices use the same VPN Tunnel IP?

I have a Cybera Firewall device that has a VPN Tunnel IP that Verifone uses to connect to the firewall to configure the Verifone Commander for Help Desk reasons. Can I use that same tunnel IP to have ...
KevGo's user avatar
  • 11
0 votes
1 answer
97 views

Cannot reach domain via HTTPS on the same server behind a PfSense Firewall

I am hosting a platform on a server which has multiple domain names, let's say example.com and anotherexample.com. I am running a Spring Boot backend on that server, which uses the domain example.com ...
Jason's user avatar
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0 votes
0 answers
29 views

Zywall ATP - Access Forward but no answer through VPN

I'm looking for a solution to my problem but all my tests have failed. Basically, I want to reach a device (10.200.195.70) on a subnet (10.200.195.0/24) via my VPN (10.200.200.0/24). If I connect my ...
Galmar's user avatar
  • 1
0 votes
1 answer
572 views

Traceroute using UDP instead of ICMP?

I am playing a game named "Planetside 2" and since a few days many users including me have high ping issues on a specific server, while others have not. Therefore I wanted to try to ...
Little Yuuta's user avatar
1 vote
0 answers
262 views

Which ports to open on the firewall for this FTP client connection?

I'm using for the first time today https://github.com/veeso/suppaftp and I'm super happy. On my local machine everything works. On production machine it does not. On production machine there is a ...
Fred Hors's user avatar
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0 votes
0 answers
75 views

Cannot access PC from Internet via IPv6

I am trying to make my computer accessible from the internet for SSH via IPv6. Unfortunately, nothing I tried so far has worked: The PC is running Windows 11, 23H2 I can use the IPv6 address (from ...
Lukas Lang's user avatar
0 votes
1 answer
65 views

routing traffic using iptables and l2tp

Internet restrictions in my country have essentially made it impossible for VPNs to work. As such, I wanted to circumvent this issue by using the following method. Although "residential" ...
Arian Noshirvani's user avatar
0 votes
1 answer
142 views

docker container reachable despite firewall denying incoming traffic

I am in the process of setting up a VPS to run a few docker packages. The firewall set up to block any incoming traffic (default) just allowing anything that comes in via Wireguard VPN. Still the ...
Christian Herzyk's user avatar
-1 votes
1 answer
71 views

Turn on Windows Firewall false notification on boot

For months now, everytime i boot my laptop, i get a false notification to turn on Windows Firewall that is already on This is so annoying and windows doesn't give an option for this specific ...
Sakis's user avatar
  • 43
0 votes
0 answers
195 views

OPNSense OpenVPN Site to Site VPN unable to reach internal networks

I've been pulling my hair out setting up a site to site vpn with OPNSense. I followed the official guide with one exception, I'm using certificates. And I saw in a video that the interfaces created by ...
Mr Twig's user avatar
0 votes
0 answers
47 views

Allow connection to modem dashboard in pf firewall

I am using Murus to manage the rules of my macos pf firewall. My approach is to block everything by default and allow only what I need. This has worked well so far, with one exception: I cannot seem ...
KenMatsuo's user avatar
0 votes
1 answer
172 views

How to get through restrictions blocking OpenVPN?

I have recently set up a VPN server on my desktop at home in the hopes I can connect to it while at the university from my laptop. I have confirmed that I can connect easily on a mobile data hotspot, ...
Mercury's user avatar
  • 101
-4 votes
1 answer
86 views

Block youtube.com via `iptables`

For productivity reasons, I want to block access to YouTube. What I have tried. I started by running: dig A youtube.com +short and then feeding the resulting address(es) to sudo iptables -A OUTPUT -...
gobbolo22's user avatar
0 votes
1 answer
75 views

I have 3 router but devices in the local network does not communicate with each other

First router (195.105.1.1) is the one that was provided by ISP and we have 2 other routers. Both are connected to ISP router. Second router (195.105.1.2) has a local network which is 165.18.0.010. ...
Agent zebra's user avatar
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0 answers
46 views

Remote connection to software not working when UWF is enabled due to firewall

I'm running Windows 10 Enterprise LTSC (version 10.0.17763). I've setup everything I need and I'm configuring UWF filters. I enabled protection for C: volume, and added a couple of exclusions for: ...
il_mix's user avatar
  • 156
0 votes
0 answers
28 views

Firewall incoming packets are dropped with VLAN configuration

In my Windows PC, installed scapy tool for sending packets from my system to raspberry Pi board connected to my machine using VLAN. In my raspberry Pi board, Firewall rules are already configured and ...
Karma Yogi's user avatar
0 votes
2 answers
263 views

Dedicated Ip Address using vpn connection

I am a newbie in Network connections and I developing an application that needs to connect to a Server "Y", the connection is allowed just for an specific IP through the firewall, this IP ...
DonMiguelSanchez's user avatar
0 votes
0 answers
71 views

Knockd not executing the knock command

I am trying to setup knock daemon, however it does not seem to execute the knock command. To debug the issue, I used this simple configuration, which is slightly edited example from the documentation: ...
Stefan's user avatar
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