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

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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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5 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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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 ...
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325 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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29 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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177 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
123 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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42 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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93 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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51 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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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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33 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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60 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 ...
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95 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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46 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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52 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: ...
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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
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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
36 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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150 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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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
353 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 ...
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825 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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72 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
311 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 ...
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1answer
56 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 ...
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253 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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141 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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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 ...
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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
40 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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92 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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118 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
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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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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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249 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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276 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
2k 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 ...
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2answers
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How to make netstat on Linux only show OUTBOUND tcp connections?

My ubuntu server is infected and there is a process making a bunch of HTTP requests to a bunch of websites (sucks!). I have added the following to my firewall (UFW): sudo ufw deny out proto tcp to ...
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1answer
584 views

Port suddenly closed. How to re-open?

I've written a software module in PHP that manages the saving of data in different data stores (MySQL, ElasticSearch and Redis). To test the module, I've created several test plans in Apache JMeter, ...
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2answers
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Limit to number of listening ports in linux

I have tried to launch a script to listen to thousands of tcp ports (1000 to 10000) but it appears to be hitting a limit of 1024 listening ports. I've confirmed this via netstat and closed ports above ...
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How to check a given connection has been offloaded to network card

From what I read, some part of the tcp protocol operation can be offloaded from kernel to network card driver thanks to TOE (or GSO, LSO, LRO..). My objective is too find if a given socket has some ...
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82 views

Simulation of TX/RX Drop

I'm trying to get the "TX/RX Drop" values to increase. I've tried dropping packets using both iperf and iptables but the statistics aren't increasing even when packets are being dropped. Is there a ...
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158 views

iptables traffic after forwarding

I have 2 servers Server A and Server B ServerA = 1.1.1.1 ServerB = 2.2.2.2 I am using ip-tables to send all traffic on port 80 to Server B on Server (A) 1.1.1.1 i have done iptables -t nat -A ...
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201 views

Ghost tcp connections: ss sees them, nothing else does

We have a strange problem. Our remote server shows over 900 connections coming from our office over port 80: # ss -n | grep ESTAB | grep $OFFICEIP | grep :80 | wc -l 935 Netstat shows a similar ...