Questions tagged [firewall]

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

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How to rate limit using iptables Ubuntu

I'm trying to solve the question how to rate limit access for IP to our Ubuntu server. I would love to block if someone requests too much frequently our API endpoint, or in general if hits too much ...
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IPv6 native and Zoom app failing to connect

I've recently got IPv6 native (dual-stack) working from my ISP to my home network. "Working" means that I negotiate an IPv6 connection, gateway, and a delegated /56 prefix. My LAN picks up ...
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wireshark in promiscous mode and firewall

My question is related to this one : Wireshark does not capture Packets dropped by Firewall but that thread doesn't answer my query. Say I have wireshark running in promiscous mode and my ethernet ...
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How do government firewalls sit between me, the internet service provider and the wider internet?

I am perplexed on how are government firewalls set up between me, an Internet service provider and the Internet servers. How do they ban or some websites or slow down their speeds? When I am connected ...
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Protect IP webcam's RTSP port 554 with firewall?

I have a IP web camera and I'm opening the port to the internet through the WIFI router. It's useful that I can check the live streaming outdoors on phones or laptops. But there's one thing I'm ...
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How to block outgoing connection to external website with ufw?

I'm using debian10 ufw, command as next: ufw deny out to 10.192.225.199 port 80 And the status as next: # ufw status Status: active To Action From -- ...
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Iptables rules for UFW

I need the following rules implemented in UFW but don't know how to do this exactly: iptables -t nat -A POSTROUTING -o eth0 -s 10.8.0.0/24 -j MASQUERADE #Note: If you use tcp protocol you must change -...
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Iptables connection rate-limit Keep-alive request

Iptables newbie here. I need to limit incoming HTTP/HTTPS connection/request rate to 20 per minute per IP on an Ubuntu server. To do so I used iptables recent with these rule (which I made following ...
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Setting up a firewall that blocks traffic that is routed through a raspberry pi [migrated]

Looking for a good way to block traffic that is routed through a raspberry pi that is setup as a network bridge. Pi connects to the wifi and then I plug the laptop into the pi via ethernet. I have ...
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UFW Doesn't Close All Of My Ports

I am trying to close all ports on a Linux Mint machine using ufw, but it seems that it is not doing that. After running sudo ufw reset sudo ufw default deny I can run SS and see that lots of UDP ...
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firewalld: Remove all pre-existing (default) rules

I have a set of machines with RHEL 8+ and SLES 15+ OS installed. I found out that firewalld is the daemon that controls the iptables firewall and its rules. When I run iptables -L and iptables -t nat -...
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How can I block this IP address range in my DSL router?

I tried much to block this IP address range between 41.128.126.0 to 41.128.128.0, but I failed and was not able to find the correct Mask Address. I even tried this site: http://networkcalculator.ca/ip-...
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Port forwarding does not work even after opening the ports in firewall

I have tried everything for enabling port forwarding on my router. I am in a university and the university provides me the internet facility to my room where I have my own router. I think the ...
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TCP communcation - HyperV virtual machine opening port on host

Here's the summary of my fight to connect to a port on the hypervisor host from a VM hosted on the same machine: Set up in the Hyper-V Manager: Virtual Switch Settings Internal 'Enable virtual LAN ...
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NAT: Getting no route to host error from private network but ping is working

I have two networks configured, one with 10.10.0.x (netmask: 255.255.255.0) this network is internet facing via gateway (10.10.0.1) and the other private network with ip range in 192.168.0.x (netmask ...
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Why am I receiving unsolicited incoming connections from the sites I visit?

This only happens while browsing. I have one of those routers that doesn't even block incoming traffic, so my computer's firewall has to do all the work. In the log below I used Firefox, but this ...
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FortiGuard firewall on mac. not sure how to delete

My highschool must have installed this awhile back. It's been a year since I graduated but it still remains on my laptop. I have even tried returning the laptop to the factory settings but this ...
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Enable protocol 2 from firewalld

I've installed kuberentes with metallb in a bare metal server, and one of the nodes gives IP address to the pod, but I can't reach it from other machines. If I disable firewalld, it works, so I've ...
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SSH into other machines on a local network that has a firewall?

My internet service is included with my apartment rent. They have a firewall and the router is inaccessible to me. I'm trying to ssh from a macOS that is connected to a wifi into my other machines (...
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BitDefender firewall: allow single IP instead of a range

I want to allow a single IP within my LAN to be able to connect to my guest server which runs on a host with NAT networking in virtualbox. I configured port forwarding in virtualbox to pass the ...
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2answers
24 views

Make hosted content accessible only to my computer

For portability I work with a lot of software that hosts content on localhost, usually as HTTP/websocket servers. My computer is connected to a LAN, so others can connect to it. My question is, how ...
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1answer
33 views

Can't connect remotely to MySQL database over network

I'm trying to connect to a MySQL database that's set up on a Linux Mint installation however I can't connect to it through MySQL Workbench: Failed to Connect to MySQL at 10.0.0.5:3306 with user root ...
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Find all firewalls in Win10

Is there any way to view all active firewalls or midware that may be blocking my internet connection ? Internet searches a la "Win10 Find all Firewalls", "Win10 installed firewalls"...
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Network Link Conditioner doesn't work on localhost (but does on external websites)

I read in a few places people saying Network Link Conditioner is supposed to work on localhost. However I never managed to get it working. It works for any of my external communications. If I use it ...
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Cannot enable or restart Windows Firewall

I am trying to fix some problems related to Windows Calculator, Clock, etc., but I encounter an error while trying to run the PowerShell command: Get-AppxPackage -allusers *windowscalculator* | ...
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Correct Router/Network settings for video streaming through public network

I am trying to take the OnVue certification exam, I practically did do the following according in: Online proctoring technical requirements Do click in the System requirements tab and click in the ...
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Working NTP rule yet no visual update

I have set the following rule on NTP on the WAN interface in OPNsense Firewall. WAN/NAT Interface - 192.168.47.2 / 24 Firewall Interface - 192.168.1.21 / 24 and the rule seems to be working However, ...
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NTP time synchronizes, still shows local time..?

I have set NTP time of Canada (0.ca.pool.ntp.org, 1.ca.pool.ntp.org, 2.ca.pool.ntp.org, as obtained from https://www.pool.ntp.org/zone/ca). The sync server IP is 192.210.199.110 (stratum 2). When I ...
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How to explain UFW firewall LAN packet from external source on non-forwarded port?

I have a small home server with hostname mango running Debian, with UFW firewall and logcheck installed. For years, my (NAT) router has a very limited number of port forwards to this mango server. ...
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How to get notification when a program is blocked from making Outbound connections in Windows by Firewall?

in Firewall settings of Windows 10, there is only an option to show notification when a program is blocked from receiving inbound connections; how can i achieve the opposite result? to receive ...
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How to allow VPN traffic in Firewall Outbound rules?

I'm blocking Outbound connections by default (except those specified by Allow rules) in Windows 10 firewall. there is only one problem I'm facing, I can't connect to VPN (PPTP or L2TP). this is built-...
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ESXi login page loads quite slow across private network

I have 2 networks, 192.168.28.0 (in VMware Workstation) and 10.0.64.0 (on a physical Dell Server). Both networks have 3 ESXi and 3 Windows Server in each. Both are behind their respective firewalls, ...
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Windows firewall might be blocking web socket port

I am trying to listen to music on the following music streaming service: https://turntable.fm/ When I visit the site and go to me and my friends room to listen to music, the websocket appears to fail ...
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FTP not getting connected from outside LAN

I am ussing FileZilla server, I created a shared folder and able to connect and transfer files within LAN. But when I try to connect from outside LAN, i am getting following error: Connect socket #...
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Physical switch to VM firewall/router for Router-on-a-stick?

I'm planning to purchase a TP-Link T2500G-10TS (TL-SG3210) switch for home lab. I already have a dell server with quad-port NIC which I will connect to the switch and I'll make VLANs. The server ...
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PC in VLAN can't ping its own gateway

My VLAN's can't ping their own gateway and beyond. 1 - For VLANs to be able to ping their own gateway, do I have to enable the Parent VLAN and assign an IP to it in the OPNsense firewall ? 2 - Do I ...
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Windows 10 Firewall suddenly blocking ALL incoming connections

We recently installed several new Windows 10 Pro workstations in a local business. I got a call yesterday that they were having trouble printing from one of the workstations to the network printers. I ...
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Port forwarding not working on router using NAT?

I have a Dlink router which uses NAT and I tried several ports but every time I try to connect my server(Raspberry Pi) it says connection refused. I can’t connect to the server on the RPi itself.
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How to blocking certain Web URLs with OPNSense

I have been trying to find how to block just some URLs but can't seem to find how. I tried by using Alias > Host (IP) and applied it to Destination in a rule but that was ineffective. The only way ...
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222 views

OPNSense Firewall Scheduled Rule does not work

I have created a schedule for internet access for a VM (10.0.64.43/27), the rule is implemented on a WAN interface but does not seem to be working. The internet access is to be allowed between 21:30 - ...
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1answer
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Firewall logs show query replied back to mdns

This setup is from the network (192.168.29.0/27) in VMware Workstation as in the Network Diagram I have setup a Windows Server VM (192.168.28.47/27), and a firewall VM NIC (192.168.1.21/24) which is a ...
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1answer
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How to block outgoing packets to IP range with iptables?

I want to block outgoing packets to an IP range but the iptables command I'm using does not seem to work. sudo iptables -P OUTPUT ACCEPT sudo iptables -A OUTPUT -s 157.240.0.0/16 -j REJECT sudo ...
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2answers
34 views

can Firewall detect vpn that a client use on their pc?

if some client uses vpn program installed on their pc,through a copmany or hotel network with internet connection and firewall, can the firewall detect that vpn connection? what would the firewall ...
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Firewall Can Ping Google DNS, VM behind Firewall cannot, all rules allowed

I have the following network setup https://i.ibb.co/wwPLH2H/Network.png All traffic from 10.0.64.0 / 27 behind FirewallB (firewallsm) reaches 192.168.28.0 / 27 network via the LAN interface of ...
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Block RDP access of all local addresses

I can connect to a server using Remote Desktop Protocol only by passing through a vpn tunnel. But the fact is I would like to connect to the RDP only through this VPN. The problem is I can still use ...
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Firewall app notifications not showing on Windows 10

After latest Windows updates in 2020, popup notifications for simplewall and FreeFirewall apps had stopped working. The closest I could find the problem was in simplewall log file: "Warning",...
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1answer
46 views

Failed login attempts, constant brute force

I'm running a VPS with an iptables firewall (configured via ufw). I have shut down all traffic with: sudo ufw default deny incoming sudo ufw default allow outgoing After that I have opened certain ...
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VPS and Network firewalls opened, still can't connect

I created a VPS on Oracle Cloud (Ubuntu Minimal image) and I'm trying to run a server on it. I tried running a simple server command first to test connectivity: sudo python2 -m SimpleHTTPServer 80 ...
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Setting up a VPN on my Firewall (Zyxel ATP200)

I just wanted to preface this by saying that I am not very experienced in networking in general and have been trying to pick up things as I am going along. My setup: I have been trying to setup a VPN ...
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Port always times out/filtered

I've been trying to port forward for like 3 days with no success, no matter how much google searching I've done. I've port forwarded on my router, allowed the ports through my firewall, reserved the ...

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