netstat is a tool for viewing active network connections, listeners and sockets.

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Can't bind UDP socket but port is free

I've been struggling for a while now with this so maybe someone here is able to help me. I'm setting up a CS:GO server that's going to be running on port 27059. (This is a copy&paste from a ...
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30 views

IIS6 - localhost/MachineName IP/Ports configuration Error after system crash and Restore

Six months ago my hosted win 2003 server crashed due to RAID drive issues while at the datacentre and I lost my installation. After a re-install I recovered my websites, (with help .. approx. 10) and ...
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27 views

Why netstat -p doesn't show PID of established connections?

I have some REST service which is listening on tcp/8051 I'm querying this service with curl in infinite loop from the same host: while true; do curl --header "Authorization: Bearer ...
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1answer
47 views

Irresponsive nginx while doing “nginx reload”

While reloading nginx, I started getting errors in messages log "possible SYN flooding on port 443", and it seems like nginx becomes completely irresponsive at that time (quite for a while), cause ...
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13 views

netstats shows my own server is hitting a server its not supposed to know about

ON AWS I have a few dedicated servers that do image processing and they seem to get high traffic and fail. when running netstat -ntu | awk '{print $5}' | cut -d: -f1 | sort | uniq -c | sort -n I ...
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36 views

netstat result showing syn sent for specific ip (local) which is not exist in LAN

I was using my web server (jboss) in different subnet (192.168.150.10/24) and after sometime, just changed to another subnet (192.168.200.20/24). But still i could see in netstat -pnt result, my new ...
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1answer
55 views

Check number of connections to webserver port 80 AND 443

As the title says how would one check the number of open connections to a webserver on port 80 and 443? I'm currently using this oneliner to get the number of open connections per ipaddress from port ...
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2answers
27 views

Port Scanning Large Sets of Targets

1)How would you check to see if a list of ~10000 IPs if they have port 80 open? 2)How would you go about the same scenario but with a port range? 3)How would you check a list of 10000 IPs to see ...
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1answer
19 views

PID 4 Using Port 80 - IIS Unable To Bind

So I've been having a problem where I can't use localhost:80 on IIS So I ran this: > netstat -ano | find "0:80" And got: TCP 0.0.0.0:80 0.0.0.0:0 LISTENING 4 ...
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31 views

How to aggregate reports given by nestat?

In this question OP gives some reports that has been generated with netstat. However, the more I look at the switches of netstat, the less I can find how to generate that report. The sample report is:...
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468 views

Weird CLOSE_WAIT statuses at standard PHP application

I am asking for help regarding tcp problems on a webserver serving a web application built in PHP. The client is a standard html/js page viewed in the web browser. This client sends Ajax requests ...
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1answer
35 views

How to find webserver running on server and find why do some web apps respond and some don't?

I didn't configure this server so I don't know what is running or where things are running. The server is some sort of rack server (1U or 2U Dell running in our datacenter) running Centos. So we ...
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292 views

How to resolve UDP packets being dropped given netstat reporting SndbufErrors

I have a server instance on an OpenStack that at a pretty high load starts loosing UDP packets. I captured all outgoing packets using tcpdump and some of them are missing, even though application logs ...
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1answer
177 views

Why does this “netstat -tln” output show entries for “0.0.0.0:22” and “127.0.0.1:3306” [closed]

When I run the command netstat -tln I see the following output: Active Internet connections (only servers) Proto Recv-Q Send-Q Local Address Foreign Address State tcp 0 ...
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58 views

What does `SYNs to LISTEN sockets dropped` from `netstat -s` mean

I could found 437 SYNs to LISTEN sockets dropped from netstat -s from the server on my server which runs nginx. I found this explanation from the man page: --statistics, -s, Display summary ...
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1answer
140 views

HTTPD listening in IPv6, according netstat, but reacheable in IPv4

Using Openstack, I have a Web GUI (horizon) hosted on my server (HTTPS). When I do a netstat -lt | grep https, I have: tcp6 0 0 [::]:https [::]:* LISTEN ...
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17 views

Ubuntu/Apache2 - Virtual host stops my MySQL server [duplicate]

I have really strange problem. I have an Apache2 server on Ubuntu 14.04 with installed MySQL server. Everything was working fine. I have multiple domains hosted on one server and i believe i received ...
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1answer
60 views

Why when i use netstat while not connected to internet, it returns some ip addresses?

I read that this command displays network connections for the Transmission Control Protocol more info link netstat ,but when i not connected to internet and i turn off XAMMP server,it returns some ...
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166 views

How to diagnose netstat: no namelist

I had to replace an NIC on my HP Proliant Microserver, running FreeNAS 9.3 In my crashplan jail, I now get "netstat: no namelist" as a response when I execute the netstat command. How to I diagnose ...
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1answer
36 views

Netcat - socket in time_wait when echoing and piping, but not when invoked directly

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 ...
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1answer
71 views

nmap shows strange open ports

Running nmap on my localhost shows me strange open ports: $ nmap -p- localhost Starting Nmap 6.47 ( http://nmap.org ) at 2015-12-28 12:14 CET Nmap scan report for localhost (127.0.0.1) Host is up (0....
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2answers
116 views

Matching an IP address to a hostname when both are available but cannot be resolved

I am an administrator on a server that accepts RDP connections. When the client connects I know the client's computer name. Using netstat I can determine which connections have been established for ...
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1answer
55 views

How to Terminate specific TCP sessions without tcpkill

I found lot of TCP connections(listed through netstat) from my Linux server to windows server. I want to kill those sessions without tcpkill cmd how can I ? Please advise ..
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23 views

netstat -r on debian give abnormal output

after looking for stuff with Debian "netstat" and try list stuff with "nestat -r" my main Server out a Long list of unkown Hosts ( mostly hacked IP´s by looking on abuseDB ) here a small example for ...
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51 views

Monitor outgoing web traffic sources on CentOS [duplicate]

I received a report today that a server I manage (Centos + Apache) is launching a bruteforce attack against wordpress websites: hacked-joomla/brobot The requests sent look like this: x.x.x.x - - [...
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63 views

cannot bind a port altough LISTEN

I'm new to this problem I'm using Ubuntu 12.04 LTS via VMware My problem is to bind port 6703 i tried alot of commands to check if this port or open or not Error Message is Failed to bind to: 0....
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24 views

How do you write the following command : if (netstat flag ==UG ) save addres IP [closed]

how How do you write the following command in ubuntu : if (netstat flag ==UG ) thene addres ip > new file I want to file contains : addres ip 152.123.12.1 123.12.12.123 ....
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24 views

CentOS 6.6 rogue mail process? Server sending spam [duplicate]

Our server has been recently compromised and was sending spam emails. We've found the php scripts responsible, eliminated them, and updated the postfix configuration. Problem is that when we ran the ...
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2answers
215 views

netstat on unix server shows strange connections

netstat is showing a lot of unknown connections from different strange places. are they just attempt to establish connection? or is my server compromised? I've removed my local addresses from the log ...
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1answer
38 views

iptable block outbound traffic for which binary?

Presently iptables is blocking all outbound traffic except for a few known/approved services. iptables logs a sample of each time it blocks (2/min), I am trying to figure out what is making the ...
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188 views

IPA Server installation: Error with port number

When I am trying to install IPA server, I am getting the following error : IPA requires port 8443 for PKI but it is currently in use. Aborting installation I checked with netstat -tuplen | grep ...
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246 views

Netstat showing multiple connections for on ssh login

I connect to my server via ssh. I am the only person who has access to connect to the server. After connecting via ssh, I run the following command: sudo netstat -tupn The output includes the ...
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3answers
370 views

Is postfix the only program that should be using port 25

My server IP was blacklisted for sending out spam and I am tracking down the program sending spam. I did netstat, and it shows a lot of programs using port 25 e.g tcp 0 182 10.205.3.7:...
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976 views

Synology open for Cloud Station even if blocking 6690 port

I have a NAS Synology beyong my Internet Box. On the Internet Box, I have UPnP not activated and I have only activated on Port Transfer the following ports : 1701/UDP, 500/UDP and 4500/UDP which are ...
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87 views

What exactly constitutes a bad TCP segment?

What constitutes a bad segment as in bad segments received in the netstat output below? I would think a TCP header's checksum could do it, but are there other things? If a segment arrives after its ...
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2answers
338 views

lsof doesn't show the established TCP connection

On my system, if I run the netstat for a port, it returns: $ netstat -nat | grep "60964" tcp 0 0 192.0.0.1:60964 0.0.0.0:* LISTEN tcp 59 0 192.0.0....
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1answer
58 views

Is it possible to deterministically trace how port 80 is forwarded and where the configuration is on a given system?

Is there a way to determine or trace how a port forwarding configuration is set up on a system running Ubuntu 14.04 LTS, on which there is a NodeJS service running and somehow accepting connections ...
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1answer
47 views

Does the netstat counter wrap around? And over what period are they collected?

If I run netstat -s on my solaris 10 box, I got a lot of network statistics. Are these counters since the time of system boot, or some other arbitrary period? And some of the numbers are quite large....
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268 views

SSH Tunnel not working

I have a number of SSH tunnels set up between our company's server (hosts website) and our customer's servers (hosts database). For all sites but one the connection is relatively stable however one ...
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1answer
171 views

How to use non-deprecated tools like ss to get process id running on a port?

I am looking for a non-deprecated way of running a command like netstat -tulpn | grep 8000 to output information about an active port. Any suggestions on how to use a tool like ss to get the process ...
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1answer
169 views

Too large 127.0.0.1 connections with nginx - apache2 [duplicate]

I use nginx as proxy-server apache2 and I have a problem with netstat output: $ netstat -ntu | awk '{print $5}' | cut -d: -f1 | sort | uniq -c | sort -n 5 109.195.36.169 6 109.195.33.205 8 194....
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1answer
892 views

Does “ESTABLISHED” state in netstat command for the sshd program mean they actually have access?

I have this person(or bot) from an IP in Chile which has an "ESTABLISHED" connection to SSHD as root on my server. I'm trying to understand what netstat's outputs really mean, the manual doesn't ...
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2answers
48 views

See stats of data in and out of each connection to a port

I have an application listening to a port. The clients connect to it using http connection. At any given time I see around 3000 connections established. I assume not all these connections are in use (...
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1answer
103 views

Concurrent connections per IP

I need to make a few changes to a firewall configuration, but before I do I'd like to see the number of concurrent Apache connections per IP. This command produces a nice list: #netstat -ntu | awk '{...
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125 views

Print last column containing spaces and special characters

I need a full path/command thats been execued to start a process thats exposed on the network - listens on tcp/udp . I did manage to get all of that using below "one liner": netstat -nlp46|tail -n +3 ...
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2answers
477 views

Is it normal to have many connections from my own server ip when I ran netstat command?

I would like to know if is it normal to have many connections from my own server ip when I ran: netstat -tn 2>/dev/null | grep :80 | awk '{print $5}' | cut -d: -f1 | sort | uniq -c | sort -nr | ...
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149 views

Why is SQL Server using all ephemeral ports connecting to itself and causing TIME_WAITs?

I've got an AWS server with Windows 2008 R2, SQL Server 2012, and Tomcat 7. When I run netstat -ano the screen is flooded with TIME_WAIT. I posted the output in a Gist. When I run CurrPorts, filter ...
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281 views

TCP High Send-q coupled with FIN_WAIT1 status

I'm having a problem with one of my webservers, which is taking minutes to completely render a web page. I had a look at the TCP connection and noticed that I have a very high value in the send-q ...
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299 views

No connection available in pool. netstat RecvQ shows high number

In our servers there is one particular dependency (java jar), which makes a total of 1024 connection to various remote servers (the library works as a service discovery). Intermittently, it is ...
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2answers
3k views

Nginx not running with no error message (ubuntu 14.04 lts)

I am trying to start my nginx server. When I type "$> /etc/init.d/nginx start", I have a message appearing "Starting nginx: Ok", and then nothing happens. When I type "sudo lsof -nP -i | grep LISTEN"...