Check status of one port on remote host

Question

I need a command line that can check the port status on a remote host   I tried ping xxx xxx xxx xxx 161 but it doesn t recognize the  host    I thought it was a  good  answer until I did the same command against a host I know has that port open   This is for a batch file on Windows that will check the status of the remote port then run a command that uses that remote port for information  then the remote port check command again  then the command that uses that port on the next server for information  and so on  I ve looked everywhere and thought the ping might do it  but there must be various versions of ping  I suppose as the server I am doing this on does not show that option   Just for chuckles  I tried a web-based remote port checker from a website - and the results were correct for both the  problem  server and the correct server   However  I can t use that in a batch run with 500  server IPs in it     Is there something I can do that is simple   My Perl skills are extremely rusty  use it or lose it   don t know any other Windows based languages except batch   Unix is my skill  but this must be executed from Widows Server 2003

User · Answer

Use nc command   nc -zv  lt hostname ip gt   lt port port range gt   For example  nc -zv localhost 27017-27019 or nc -zv localhost 27017   You can also use telnet command  telnet  lt ip host gt  port

User · Answer

You seem to be looking for a port scanner such as nmap or netcat  both of which are available for Windows  Linux  and Mac OS X   For example  check for telnet on a known ip   nmap -A 192 168 0 5 32 -p 23   For example  look for open ports from 20 to 30 on host example com   nc -z host example com 20-30

User · Answer

In Bash  you can use pseudo-device files which can open a TCP connection to the associated socket  The syntax is  dev  tcp udp  host ip  port   Here is simple example to test whether Memcached is running    lt  dev tcp localhost 11211  amp  amp  echo Port open    echo Port closed   Here is another test to see if specific website is accessible     echo  HEAD   HTTP 1 0   gt   dev tcp example com 80  amp  amp  echo Connection successful  Connection successful    For more info  check  Advanced Bash-Scripting Guide  Chapter 29   dev and  proc   Related  Test if a port on a remote system is reachable  without telnet  at SuperUser   For more examples  see  How to open a TCP UDP socket in a bash shell  article

User · Answer

For scripting purposes  I ve found that curl command can do it  for example     curl -s localhost 80  gt  dev null  amp  amp  echo Connected     echo Fail  Connected    curl -s localhost 123  gt  dev null  amp  amp  echo Connected     echo Fail  Fail    Possibly it may not won t work for all services  as curl can return different error codes in some cases  as per comment   so adding the following condition could work in reliable way        curl -sm5 localhost 8080  gt  dev null  echo         7    amp  amp  echo OK    echo FAIL   Note  Added -m5 to set maximum connect timeout of 5 seconds   If you would like to check also whether host is valid  you need to check for 6 exit code as well     curl -m5 foo 123          6 -a       7    amp  amp  echo OK    echo FAIL curl   6  Could not resolve host  foo FAIL   To troubleshoot the returned error code  simply run  curl host port  e g      curl localhost 80 curl   7  Failed to connect to localhost port 80  Connection refused   See  man curl for full list of exit codes

User · Answer

Press Windows   R type cmd and Enter  In command prompt type  telnet  machine name ip   port number    If port is not open  this message will display    Connecting To  machine name    Could not open connection to the host  on port  port number     Otherwise you will be take in to opened port  empty screen will display

User · Answer

In Command Prompt  you can use the command telnet   For Example  to connect to IP 192 168 10 1 with port 80   telnet 192 168 10 1 80   To enable telnet in Windows 7 and above click  From the linked article  enable telnet through control panel -  programs and features -  windows features -  telnet client  or just run this in an admin prompt    dism  online  Enable-Feature  FeatureName TelnetClient

User · Answer

I think you re looking for Hping  http   www hping org    which has a Windows version       The interface is inspired to the   ping 8  unix command  but hping isn t   only able to send ICMP echo requests    It supports TCP  UDP  ICMP       It s also very useful if you want to see where along a route that a TCP port is being blocked  like by a firewall   where ICMP might not be

User · Answer

nc or  netcat  also has a scan mode which may be of use

[windows] Check status of one port on remote host

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