nixCraft

I am not able to find a particular user name which is used to login over ssh, in /etc/passwd and /etc/shadow file. Login attempt is successful because I can found that username when I issue "w" command (“w” command is same as “who”).

Strange thing is that I can even create user with same name with which I am already logged in (no error reported). I think user creation is also successful because, now I can find the user name in /etc/passwd file. But when I try to delete that user an error occur (telling that user already logged in).

Any idea about this issue??????? Mind that I am using SSH to connect Linux. I think my Linux is bit different.
Here is the description about the OS... OS name - Linux, OS release - 2.6.14VENTURI64, OS version - #5 SMP.
Any idea how to configure a user like that??????????????

Thanks
Subrata

Maybe you have 2 users using the same ID ? Check and see if there is 2 users with the same ID.
And please give us the following:
cat /etc/passwd
cat /etc/group
ls -la /home

+ please give me the answer for the cmd:
id

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Sorry I cant get u. Actually what do u mean by two users with same ID ?? From where I should check that two users have same ID or not?????????????? How can we configure that ?????????????????

cat /etc/passwd
--------------------------
root:0:0:root:/root:/bin/bash
uucp:*:1:1::/tmp/NOLOGIN
man:*:65533:65533::/tmp/NOLOGIN
nobody:65534:65534::/tmp:NOLOGIN
admin:1000:1000::/home/admin:/usr/sbin/runcli
pcap:1001:1001::/mnt/cache:/bin/false
squid:1002:1002::/mnt/cache:/bin/false
vrtsp:1003:1003::/var/log/vrtsp:/bin/false
sshd:1004:1004::/var/empty:/bin/false
ntp:1005:1005::/dev/null:/bin/false


cat /etc/group
-----------------------------
root:0:root
uucp:1:uucp
tty:2:
users:100:
man:65533:man
nobody:65534:nobody
admin:1000:
pcap:1001:
squid:1002:
vrtsp:1003:
sshd:1004:
ntp:1005:


ls -la /home
-------------------------------
drwxr-xr-x 3 644 admin 1024 Mar 25 00:11 .
drwxr-xr-x 5 root root 1024 Mar 25 00:11 ..
drwxr-xr-x 2 644 admin 1024 Mar 25 00:11 admin



And wt do you mean by "please give me the answer for the cmd: id" ??????????????????????


Subrata

Please keep in mind that "admin" is not the user we are tring to login. We are able to sucessfully login over SSH with another user(xmladmin) which is not present in /etc/passwd file. And we do not have any directory in /home folder with the name "xmladmin" .........

You may be using OpenLDAP or SAMBA or NIS centralized authentication. Let me know if you need any further help!

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I am not sure about whether OpenLDAP or SAMBA or "NIS centralized authentication" is used or not ????????But I think they are not used....... Please tell me how I can check whether OpenLDAP or SAMBA or NIS is used in my system or not ????????????? And if possible plz describe a little bit how they take part in linux login process ........

Subrata