I have read other threads regarding sockets in TIME_WAIT, but I am clearly still missing something. Below is a few lines from a “netstat -an”. How could it get into this situation? If I understood the descriptions I found, we should not have more than one instance of the socket 63444 … but after the … Read more
I’m testing an application using netcat (nc) and I’m getting very low throughput on network connections. When I ran netstat -tnpo I see numerous TCP sessions in TIME_WAIT. I’m sending data to my application via a bash script as indicated below: while true; do echo “<required string>” | nc server_ip port done If I instead … Read more
I have a website running on a Linux Debian Squeeze server with Apache 2. The website is the only one on the server and the traffic to the website is very low (800-1000 connection per day). The problem is that when I run the website on Chrome the “Wait” time is very long (1 min, … Read more
I am a data scientist / machine learning developer. Sometimes, I have to expose my models by providing an endpoint. I usually do this via Flask and gunicorn: exampleproject.py: import random from flask import Flask app = Flask(__name__) random.seed(0) @app.route(“/”) def hello(): x = random.randint(1, 100) y = random.randint(1, 100) return str(x * y) if … Read more
Not sure what it is, but everytime I try to run one http request from browser, second must wait for first to fisnish. Is it server side configuration/seciurirty? For example, I have 2 files long.php and short.php. After making request to long.php one I totally cannot open short.php. After long.php is finished, short.php is then … Read more
I’m using CentOS version 7.7. A few days ago my frontend page (not whole website) TTFB is exactly 1 min. How I can check which process causes that? I’m using PHP 7.3 php-fpm ON Any way to check which process cause waiting for the first byte 60 seconds? https://i.stack.imgur.com/sYGze.png This error I got a few … Read more
Windows 2008 R2, standard. No firewall locally on it. Newly setup because an old SQL2000 had two disks die (or could it be the raid controller?) at the same time. Luckily, I had fresh backups. The databases have been restored, and SP2 for SQL2008 applied. I can see various hosts trying to establish a session, … Read more
Already asked the question on stackoverflow but i guess this might be a better place for it. I’m currently struggeling with a strange problem: while using adodb as connection layer for php, it leaves many sleeping and unneeded connections behind. wait_timeout is set to 20 but there are still plenty (~100) of sleeping connections due … Read more
I would like to make my system more resilient against certain failure. When the system makes rapid outbound TCP connections fail, the nf_conntrack table fills up with TIME_WAIT entries. This causes other operations on the system to fail as there are no more nf_conntrack entries available. I know that it is possible to modify certain … Read more
I have a server with large number of TIME_WAIT sessions. These are sessions that the server closed, but the client didn’t close. I want to analyze a sample session, to understand what happens there. Simple “brute force” analysis of tcpdump output isn’t productive, as most sessions are closed OK. Is there a way to dig … Read more
