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237 questions
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I have a Fedora server with some ports opened on the machine firewall, namely the ssh (22), ftp (21, 30000-31000 for passive). ftp ports only accepts connections coming from within the LAN (192.168.0....
vivus's user avatar
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0 answers
36 views

I need to add a new account to Outlook. This account belongs to a postfixmailserver. For POP settings, I set port number 110 for incoming and port number 25 for outgoing mail. As the server doesn't ...
lachin's user avatar
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My UFW is set to default deny incoming, and I have explicit rules to allow connection to SSH and HTTP ports. I want to get logs for those two ports. At logging level low, UFW logs attempts made ...
Kleo's user avatar
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3 votes
2 answers
107 views

I tried tcp_connect, udp_sendmsg kprobes together on an eBPF program and it worked, but it missed a lot of connections. I couldn't really get any reliable results with other kprobes as well so I tried ...
Subtle Development Space's user avatar
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i have a running vpnc connection from my arch-linux device. All traffic goes through the tunnel to the vpnc server. But i need to exclude the 443 port, because a running https server need to be ...
user3008086's user avatar
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I'm trying to dockerize a rpc application I made using C lang and rpcgen, I have the byte executable and everything, I tried a lot of docker os image like ubuntu 22.04/ debian and so on, the ...
ALLAOUA Okba's user avatar
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Named ports can be defined in /etc/services but none of curl, http.Get() (Go) or reqwest::get() (Rust) respects the definition. While it is possible to manually lookup the integer port number by the ...
ynn's user avatar
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0 votes
1 answer
222 views

I have disabled a USB (2.0) port on a production Linux system with this command: echo 1 > /sys/bus/usb/devices/usb2/2-1/2-1.8/port/disable It successfully disabled the 8th USB port on hub #1. ...
Elisa K. K.'s user avatar
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35 views

In Linux, if I enable net.ipv4.tcp_l3mdev_accept with sysctl utility, I can reach all TCP ports listening at 0.0.0.0/[::] if there is a reachable IP inside a VRF. The listening point can belong to a ...
przemyslawo's user avatar
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I've seen this has an answer while there is no data being transmitted, but what about for when it is? Is this something I need to look into or am I fine? This was taken off my Nethogs
Apailox's user avatar
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1 answer
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In my InfoSec course assignment, we were given the task to analyze the different communications that were displayed when we run the command netstat -an. While analyzing I saw the following ...
Ace is here's user avatar
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2 votes
2 answers
340 views

I want to reserve certain port numbers on a VM host for use by the VMs themselves. Is there a mechanism by which the host can exclude those ports from being allocated to processes not related to the ...
vfclists's user avatar
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I'm working on a private Debian package that deploys a service which binds to port 80. [Service] ExecStart=/usr/bin/foo --port 80 I realize almost every other package which serves HTTP is also going ...
Stewart's user avatar
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1 vote
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78 views

I got a problem with an openvpn server on dedicated hosting vm - the problem is that the packets do not pass to the client after the connection is established (although during the establishment of ...
garik f's user avatar
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1 vote
0 answers
311 views

I'm currently trying to install Arch Linux on a new disk, but I'm encountering a networking issue that I can't seem to resolve. I'm getting a "Destination Port Unreachable" error when I try ...
samcio's user avatar
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