Questions tagged [netstat]
analysis tool for statistics about active connections, open sockets, routing tables; in general the networking subsystem.
232
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network services reachability troubleshooting
I have voyage linux on a system. It is running an apache server and an sshd. For some reason, i cannot connect to those services from another machine. There are no error logs that i have been able to ...
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1
answer
46
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How to find a process by network domain it requests?
I noticed my Linux machine makes many DNS queries for a specific domain (subdomain) malicious.foo.bar
How can I find out which application or process tries to resolve this domain?
I also want to see ...
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1
answer
48
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Can two servers bind the same port?
I was surprised to discover that two servers I'm maintaining are both able to listen on port 3000 in development at the same time.
With the first server running, netstat shows
▶ sudo netstat -nap ...
- 103
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31
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NFS: how can i make nlockmgr relinquish a port
I was running Nfs-server on a rhel7.8 machine. Now the NFS server has been stopped but a Port 35191 is listening on the server, verified it using netstat and telnet. I tried various ways to find the ...
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1
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65
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Sorting lines based on certain digit pattern
Assume I have a text file with the following lines:
192.168.1.1.55555
192.168.1.1.55555
192.168.1.1.5555
192.168.1.1.555
192.168.1.1.55
192.168.1.1.55
192.168.1.1.5
8.8.8.8.4433
8.8.8.8.443
8.8.8.8....
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1
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74
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How to show the "syn_sent" socket state on Linux in realtime?
I want to see the state "syn_sent" of socket in realtime during the connection process
ss or netstat or any command
I have tried those commands, but all fail
watch netstat -tnaop|grep -i syn
...
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1
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39
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View extended stats for listening ports (using ss?)
With ss -tuiOp we can view extended stats for an outbound process, e.g.:
tcp ESTAB 0 0 192.168.68.108:32862 52.86.220....
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163
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Fresh Fedora 35 - what are these active internet connections doing?
To get to this point I had a Fedora workstation 34 install- iso about a week old - ran update, rebooted, click Install Fedora 35 as it was on offer from gnome Software. Hadn't even opened Firefox yet. ...
- 135
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1
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56
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Which interface does a specific IP address will get routed over?
Is there a way to determine which netdev or IP link interface that a given IP address will route over … in bash/shell language?
This is not about what an IP address is, given a network device name.
...
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145
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rhel + any best practice to minimize the CLOSE_WAIT sessions from linux side
when we perform the following cli on our rhel machine we get more then 600 CLOSE_WAIT lines
lsof -i tcp:8088 | grep CLOSE_WAIT
java 31100 yarn 385u IPv4 208022048 0t0 TCP master02.hgti.com:...
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85
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how to know what the process that connected to my machine VIA specific port
with the following command I want to get which are the IP's that connected on my machine with port 8088
18.23.292.9 is machine that resource manager service is running on with port 8088
ss -tanp | ...
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1
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174
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netstat cannot find opened port by iptables
My Linux command is following:
iptables -I INPUT -p tcp --dport 5002 -j ACCEPT
iptables-save
netstat -natp
but the result of netstat has no item about 5002.
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1
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61
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iproute2 ss - not showing process/pid information if user is not the same user as listening process?
Is it normal behavior, or a bug, that when I run ss -nltp, I only see the process/pid information if the user I am running ss -nltp as is the same user as the listening process?
$ docker run -it --rm ...
- 23
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179
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Random SSH Agent Generates on Boot in tmp Directory Even with Networking Disabled
On a recently installed Debian system I noticed that every boot, even with no networking, a folder and empty socket file are generated in /tmp/ssh-(random_letters)/agent.xxx.
On every boot the random ...
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2
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126
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How I can grep data with some spaces and ignoring block?
I am trying to retrieve Local Address-port with port number in different block used by each IP-address in Foreign Address and PID/Program name) from the following and store it in a file:
I used:
...
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3
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1
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279
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How to find applications/ports that do bind() but don't do listen()?
When a faulty application calls bind() with a TCP socket to a port P but does not follow with listen(), the port P is not listed among open ports, i.e. netstat or ss or ls /proc/net/tcp do not show it,...
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1
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455
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How can I get CentOS to correctly list open ports?
I am working with CentOS 7 OS hosting a set of docker containers.
By using a web browser I can reach a service on port 80 and I get back a response.
A bit of local knowledge helps me understand that ...
- 113
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1
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123
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netstat -lnp outputing results without PID
After using netstat -lnp I wonder how comes some of the result don't show any PID/Program name? Should I be worried? See below:
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local ...
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165
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How can I find out which processes are using my ports? Weird netstat output [duplicate]
I am trying to start a server that listens on 8080, but getting an error that the port is already in use. I am not running anything using that port.
Running netstat -ano -p tcp | grep tcp6 shows ...
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3
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74
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Can anyone get the default ip using only netstat -rn, while, read, and cut command?
As you can imagine, I should only use these commands to get the default IP of my virtual machine. netstat -rn gives the following output
Kernel IP routing table
Destination Gateway Genmask ......
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1
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What does address 224.0.0.251:5353 represent?
I read some tutorials,they say that netstat is deprecated. I tried ss command. THis is the output
Netid State Recv-Q Send-Q Local Address:Port ...
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247
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socket statistics (ss) program weird ipv6 listening socket address format
I have two services listening on TCP/IPv6 sockets, ssh and mysql. ss shows this:
$ ss -tl6
State Recv-Q Send-Q Local Address:Port Peer Address:Port
LISTEN 0 128 ...
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0
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859
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How does netstat find ESTABLISHED connections
If I perform an operation that establishes a TCP connection (e.g., an HTTP connection), the first thing that happens is that the 3-step TCP handshake is made. If I then use netstat, it shows me that ...
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1
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104
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loop using grep and adding to file
I am trying to loop a netstat and grep the results by some values, and then if they match- add them to a file, but it doesnt do a grep, but just adds the whole file:
#!/bin/bash
while true
do
sudo ...
- 101
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1
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74
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Netstat doesn't show URLs while streaming from Youtube
Learning about networks and trying to make sense of netstat output. This is the main confusion:
When I run the command, there are no known URLs. For example, I'm listening a Youtube streaming and was ...
- 164
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1
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63
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Netstat Killing Bash Process [duplicate]
I have a bit of bash script like this:
echo "Number of Connections: "
Conns=$(netstat -an | grep -c ‘8800.*OK’)
echo "Done"
It appears to stop processing after netstat. The ...
- 117
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1
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448
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What is the modern equivalent to netstat -peanut
I heavily rely on viewing output of netstat as in
sudo netstat -peanut
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address Foreign Address State ...
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1
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1k
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Port 3000 is always being hogged by grafana-server
I need port 3000 free for my dev work. But it's being used by grafana-server, that I don't remember ever installing. We do use it within our company so perhaps at some point it has been added to ...
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419
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ss showing socket stuck in SYN-SENT with no traceable PID
On a client I see the following:
[root@redacted_local ~]# ss | grep -i syn
SYN-SENT 0 1 redacted_local_ip:792 redacted_server_ip:nfs
...
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1
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66
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what are the options to close manual the port correctly or release the port on rhel machines?
we have redhat 7.5 server
we are suspect that port 50070 not closed correctly by the service , ( we check by netstat and PID not found ) but from the log we can see that port is in use
so we try to do ...
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420
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linux + port in use + but no PID return from netstat to kill the PID
we have Hadoop cluster - the linux are rhel 7.5 machines
and namenode is using the port 50070
we can see from the log that port 50070 is in use
but the interesting thing is that when we do netstat -...
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696
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Configure static routing for the virbr0 using local interface as next hop
Having the following topology:
hostA(virbr0: 192.168.122.1) -- TAP interface -- (eth0: 192.168.122.85) gw (eth1: 192.168.3.51) --- (LAN: 192.168.3.0/24)
gw : QEMU VM Guest, that is acting as a gateway ...
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145
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Does netstat -l include anything that netstat -a does not have?
I am using Ubuntu 16.04, but I believe my question applies to many distros, such as Debian, CentOS, and Red Hat.
The manpage for netstat -l is:
Show only listening sockets. (These are omitted by ...
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2
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502
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How can I confirm which process is connect to remote port?
My loacl server IP is 192.168.122.100, and remote server IP is 192.168.122.50. I need to kill all processes which connect to 192.168.122.50:56666. By executing ss comand, I found there are three TCP ...
- 353
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2
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1k
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'ss' shows multiple listening pids for same port
We have sh scripts using 'netstat' in our production code. We use command 'netstat -lntup' to retrieve all the pids which are listening to some port. I replaced the command with 'ss -lntup. Now, for ...
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209
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How do I parse information from netstat?
How do I extract the following from the output of netstat -anp?
remove ip address
remote port
local application name
local port
PID
I need this information to run in my conky. It shows everything, ...
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4
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2
answers
2k
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What is the alternative of netstat in linux? [duplicate]
'netstat' is deprecated for Linux os. So I am looking for the right alternative of the 'netstat', So what will be right alternative for netstat?
I found out one 'SS' command but it is not sufficient ...
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230
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How to monitor a UDP specific port/socket?
I have an application that receives UDP packets at port 5000.
In order to be 100% sure that the application is receiving all packets (for example the RX buffer could be full and some packets could be ...
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what does mean 0.0.0.0:22 under the column local address of netstat command?
Under the column "local address" of netstat:
0.0.0.0:22 means that access to port 22 is allowed from any ip addresses.
which ip addresses? ip addresses within my local network or outside my local ...
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264
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How to block a service (xrdp) from using a specific port?
I'm admin for some devs and they requested that a port on a machine be clear for a specific purpose. When one of the devs went to use that port, it was in use. An netstat -p showed that xrdp/Xnvc was ...
- 379
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56
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Running netstat on 2 servers checking connections to the other one shows mismatch in number of connections
If I check how many connections serverA (192.168.1.1) has open to serverB (192.168.2.1), I get the following response:
[username@serverA ~] $ netstat -n | grep 192.168.2.1
tcp 0 0 192.168....
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2
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Closing a port listening on a local host
How do i close a port listening on a local host in CentOS7?
So far I have used the below command to find the process id
sudo netstat -tlpn | grep 5601
Then, used the below command to kill the ...
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0
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46
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The output of netstat -an show several lines twice
Why the output of "netstat -an" shows several lines twice (48035 and 48036)?
netstan -an
udp 0 0 0.0.0.0:48120 0.0.0.0:*
udp 0 0 0.0.0.0:...
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How to not show localhost in ss output?
When I type ss -atur I get lots of connections, but most are destined for localhost and I don't really care about those.
How can I filter the output to not show connections with destination localhost?...
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54
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Is there a way to increase the 'Foreign Address' Field in 'netstat -tup'
OK, my question is completely in the title.
Is there a way to increase the 'Foreign Address' Field in 'netstat -tup' ?
(for those who never used -tup, it is the same like -tupn but resolving the ...
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1
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1k
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What is this : ^[3;J^[H^[2J?
I am on a Debian system fresh installed, logged in via ssh on /dev/pts/0, and have entered the following command
watch -n 10 clear > /dev/pts/0 ; netstat -tupn 2>/dev/null | grep -v 3306 > /...
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32
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is it possible to check the time that l application start to using port and established
From the following netsta we can see that Air_metal application is using port 50070 and established
# netstat -anp | grep :50070 | grep ESTABLISHED
tcp6 0 0 100.14.74.11:48148 100.14....
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189
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AIX netstat -a proto column
Greetings everyone,
I am looking at the output of the "netstat -an" output on an AIX 7 server and the proto column has confused me a little bit. First, the output:
Active Internet connections (...
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461
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Many Send-Q have packets TCP connections, is this abnormality? what caused this?
The 125.193.242.25 is a CDN node, and when I analyze the TCP connect, there shows below information:
[root@hkk10 ~]# netstat -na
Active Internet connections (servers and established)
Proto Recv-Q ...
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0
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155
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ss is slow when process option (-p) used
When checking for process listening on port using ss command, it's slow when compared with (obsolete) netstat command.
$ time ss -nlp | grep -E ':8081|:8007|:8010'
LISTEN 0 100 ...
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