Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: Telnet deny
Top Forums UNIX for Dummies Questions & Answers Telnet deny Post 53313 by PxT on Monday 12th of July 2004 04:04:28 PM
Old 07-12-2004
Do you really get zero output when you run the command? No error messages? What are the permissions on the telnet binary?

Code:
ls -l /usr/bin/telnet

Do you have telnet aliased? Run:

Code:
alias

and look for anything involving telnet.
 

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

deny ssh from root - how to?

using redhat 7.2 Is it possible to not allow root to ssh into the server remotely, but allow the account that ssh'd in to the box to su to root? This way there is the added security of a hacker needing two passwords to hack your computer, a username/password for a regular account and also the... (3 Replies)
Discussion started by: theDirtiest
3 Replies

2. UNIX for Dummies Questions & Answers

ftp allow/deny list

OK, let see, i have a Tru64 Unix and need to know how the list of ftp users works and in /etc/ftpusers we have the unauthorized users but when we create a new user i want this users put automatic for deny access ..... where i set when creation of users action put automatic the user in that file?... (1 Reply)
Discussion started by: wbendek
1 Replies

3. AIX

Deny root rlogin

Hi, I have to forbid root-logins on all my servers, expect from two machines, these 2 machines login with root without a password it was quite easy with ssh, but I have a problem regarding rsh/rlogin, an there are a lot of rsh jobs, so it would take a lot of time to change all this... (4 Replies)
Discussion started by: funksen
4 Replies

4. IP Networking

how to deny someone to use ftp command ?

hi,all, i have a question to trouble you. a workstation named AAA, and open the ftp services to permit user download and upload files. i have root password. a pc install windows 2k named BBB, someone install a serv-u ftp ( a ftp server software ) to transfer data. i don't have the... (4 Replies)
Discussion started by: yarx
4 Replies

5. Solaris

how to deny ftp access

Hi , I want to deny ftp access to some user. Currently I don't have /etc/ftpusers file. From the man page , i can modify the login shell at /etc/passwd to invalid one. How to add it ? replaced with /dev/null or something. If you have any other method to disabled it . Pls show me. My FTP is... (10 Replies)
Discussion started by: skully
10 Replies

6. Shell Programming and Scripting

Webpage to Telnet via Perl and Expect: Telnet problem?

Somewhat long story: I have a simple Perl CGI script that uses Expect to Telnet to a device and grab some data, and then spits it back to Perl for display on the Webpage. This works for many devices I've tried, but one device just fails, it keeps rejecting the password on this device, only... (1 Reply)
Discussion started by: jondo
1 Replies

7. AIX

allow / deny root logins

Hello everyone I have to limit the root logins on my aix box (aix 5.3) I change the value on the /etc/security/user default (login and rlogin) change to false and add to root (rlogin and login = false) I tried in different ways but I got the same. Root still can login I try algo... (6 Replies)
Discussion started by: lo-lp-kl
6 Replies

8. UNIX for Dummies Questions & Answers

Hosts.deny entry

Hello I want to block individuals who attempt to use ssh to loggon to one of my machines from a certain IP address. I added the following entry in hosts.deny. Will the entry do what I want to do? ssh: 202.111.128.225 (3 Replies)
Discussion started by: mojoman
3 Replies

9. AIX

Deny rsh,tn,or rlogin

Is there a way to deny access to a specific remote login option. example: usera--deny telnet access but keep rsh and rlogin userb--keeps telnet, rsh, and rlogin I'm basically trying to contol the access per services instead of changing the LOGIN REMOTELY(rsh,tn,rlogin) option to yes or no. (12 Replies)
Discussion started by: leemalloy
12 Replies

10. UNIX for Dummies Questions & Answers

/etc/hosts.deny

Hi there, For /etc/hosts.deny was it used to deny access from the internet? (2 Replies)
Discussion started by: alvinoo
2 Replies

LEARN ABOUT HPUX

nstrtel

nstrtel(5)							File Formats Manual							nstrtel(5)

NAME

       nstrtel - specifies the number of telnet device files the kernel can support for incoming telnet sessions

VALUES

   Failsafe
   Default
   Allowed values
       (Subject to available physical memory.)

       It  is best to use the default value, and there should not be any need to lower it.  However, if the simultaneous telnet connection load is
       very high, then the value of could be increased.

   Recommended values
       (Default value.)

DESCRIPTION

       The telnet daemon uses two STREAMS-based pseudo-terminal drivers and The kernel parameter, can be used to tune the number of  pseudo-termi-
       nals.   specifies  the  number of kernel data structures that are created at system boot time that are required to support the device files
       used by incoming telnet sessions on a server.  If the command or SAM is used to create more telnet device  files,  the  value  of  must	be
       increased  accordingly  or the device files cannot be used because there are no kernel data structures available for communicating with the
       system.

   Who Is Expected to Change This Tunable?
       Anyone.

   Restrictions on Changing
       Changes to this tunable take effect at the next reboot.

   When Should the Value of This Tunable Be Raised?
       When there is an increase in the load of telnet connections and there are no device files available to open telnet connections,	then  this
       kernel parameter should be increased.

       When  the error is encountered, then the device files have been exhausted and should be raised.	Once the value of is raised, should be run
       to create new device files.  (If SAM is used to raise the value of is run automatically.)

   What Are the Side Effects of Raising the Value of This Tunable?
       More resources would be consumed.  Extra kernel data structures, and extra device files may clog the system.

   When Should the Value of This Tunable Be Lowered?
       It is not advisable to lower the tunable value from the default value.  Consult HP Support before lowering this tunable	from  the  default
       value.

   What Are the Side Effects of Lowering the Value of This Tunable?
       Though not recommended, there would not be any side effects.

   What Other Tunables Should Be Changed at the Same Time?
       None.

WARNINGS

       All  HP-UX kernel tunable parameters are release specific.  This parameter may be removed or have its meaning changed in future releases of
       HP-UX.

       Installation of optional kernel software, from HP or other vendors, may cause changes to tunable  parameter  values.   After  installation,
       some  tunable  parameters may no longer be at the default or recommended values.  For information about the effects of installation on tun-
       able values, consult the documentation for the kernel software being installed.	For information about optional kernel  software  that  was
       factory installed on your system, see at

AUTHOR

       was developed by HP.

SEE ALSO

       insf(1M), telnetd(1M), telm(7), tels(7).

							     Tunable Kernel Parameters							nstrtel(5)
All times are GMT -4. The time now is 03:20 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy