What should I check first when NGINX fails?
A failure needs to be narrowed down before settings are changed or operations retried. Which evidence best separates application errors from environment and dependency problems?
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nginxWhat happens if two local systems download the same resource on same port?
I'm aware of NAT table. I just want to know what happens if two clients in a private local area network want to download exactly the same resource on the same port? In other words , When a packet comes from the server, how can the router decide which client is supposed to get this packet? If I'm not wrong, the incoming packet from the server has destination
How to find out what service is listening on a specific port of a Ubuntu server without proccess id?
I have decided to post this question even though there are a lot of similar questions, but none of them answered mine. I periodically check the ports my server listens to. My ubuntu OS by the output of lsb_relase -a : Distributor ID: Ubuntu Description: Ubuntu 20.04.3 LTS Release: 20.04 Codename: focal I run the command netstat -tulpn4 and the output shows a
ubuntuHow do I dump raw data from a TCP port in Windows using the netsh command?
I have an apparently simple issue which is proving very difficult to find an answer for. The site has a highly-secured Windows Server 2019 installation and an appliance connected to it running on a certain TCP port. I need a sample of the raw data coming out of that port, taken for a few minutes, dumped into a binary file. It needs to be as raw as possible (
Do AWS Security Groups and rules and Network ACLs REJECT or DROP traffic?
AWS Security groups and AWS VPC Network ACLs are 2 solutions for controlling traffic in VPCs. When rules in either deny an IP packet, do they REJECT or DROP (in the iptables sense )? That is: are packets silently dropped, or does the firewall respond with a RST/ACK (tcp) or ICMP Port Unreachable packet?
Wireguard Unable to Complete Handshake on Android only 4G network
I have a Wireguard server on my home network which works fine on all my devices, including my phone when it's connected on Wi-Fi. The problem comes when I disconnect from the Wi-Fi and go on 4G, now my phone is unable to complete the handshake with my server. On my router, I have UDP port 51820 forwarded to my Wireguard server. On my phone, I connect to the
difference between 0.0.0.0 and * network in ss output
The ss command seems to distinguish between * and 0.0.0.0 . While the listing of ssh with 0.0.0.0:22 and [::]:22 is clear, *:7946 and *:80 is not quite as much. $ ss -ntl State Recv-Q Send-Q Local Address:Port Peer Address:Port LISTEN 0 128 0.0.0.0:22 0.0.0.0:* LISTEN 0 128 *:7946 *:* LISTEN 0 128 *:80 *:* LISTEN 0 128 [::]:22 [::]:* Why isn't it 0.0.0.0:794
linuxARP keeps getting old/wrong MAC address for gateway
We have implemented a new firewall. My clients (Windows 10/11) and servers (Windows Server 2012R2) are randomly disconnecting from internet. If I do an arp -d , then my gateway (10.0.0.1) MAC is ac-xx-xx-xx-xx-81 and I can't access the internet - I get a Reply from 10.0.0.1: Destination net unreachable. . After like 10 seconds I get internet back and everyti
Backup internet connection for specific process
I'd like to add a secondary backup internet connection to my Linux server. I plan to use a USB LTE modem for this purpose. Because this cellular connection will be metered, I want to limit the amount of data that can be consumed to the absolute minimum necessary. I have a custom server application that I can make any changes to. It has a few tasks where unin