This is a ssh loop test, this is perfect test tool if you setup a application that need SSH communication between each other, like IBM Spectrum Scale.
Open the shell script ssh-test.sh with your favorite editor like vi/vim or nano.
In the SERVERS=('test1' 'test2' 'test3' 'test4') section, replace the test1-4 with the FQDN, Hostname or IP Address to test SSH against.
When that is done, login as the user you want to test and run the script. ./ssh-test.sh
user@server1:~# ./test.sh
[SUCCESS] Access from server1 to server1
Connection to server1 closed.
[SUCCESS] Access from server1 to server2
Connection to server2 closed.
Permission denied, please try again.
Permission denied, please try again.
user@server1: Permission denied (publickey,password).
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[WARNING] server2 can not access server1
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[SUCCESS] Access from server2 to server2
Connection to server2 closed.
For Succssful connection will you see [SUCCESS] Access from XXXX to YYYY
For unsuccessful test you will see
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[WARNING] server2 can not access server1
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This has only been tested on CentOS Servers. It will guarantee not work on a Windows Host. AIX, Linux or any other UNIX based operating system it should work.