How to disable telnet

Davian · 04-30-2008, 08:16 PM

I did a port scan & the scan revealed that I a port open. The port is used by telnet which is disable in the services section. what else can I do to fully disable telnet?

**TriggerFinger** · 04-30-2008, 08:23 PM

hi Davian,

telnet (AFAIK) uses port 23. close port 23 in your firewall. after closing the port, run port scanner again.

Davian · 05-01-2008, 07:47 AM

I tried that it didn't work. I am using Zone Alarm Internet security.

cheescake · 05-01-2008, 07:58 AM

Try this...

Start > Run > type Services.msc

A windows should open up if you type it correctly. On the left pane you should see a list of services. Go down to Telnet and right-click it. Click properties so that a new windows opens. Look for something that says "Startup Type" and change it to disabled. Now look at the services status on the bottom of that windows and click disable. now backtrack by clicking OK/Apply then your all done

dj_kiwi · 05-01-2008, 08:14 AM

are you port scanning on your LAN ?

You should be fine behind a Router/Firewall...

also try : www.nmapyourself.com

**TriggerFinger** · 05-01-2008, 08:27 AM

what port scanner did you use? try nmap for windows

http://download.insecure.org/nmap/di...4.60-setup.exe

Davian · 05-01-2008, 09:18 AM

That was the default setting Cheescake. Yes I am behind a router,NAT and firewall. I used http://probe.hackerwatch.org/probe/probe.asp and https://www.grc.com/x/ne.dll?rh1dkyd2. Both said I had Telnet open.

cheescake · 05-01-2008, 10:37 AM

Try using netstat -aN to see if your computer is listening/established on port 23 on any interface

If it is then you can rule out your hardware although if not then the issue is hardware since its not running.
Also if you ave another computer to test with, you can get an outside IP address (perform this over WAN link, no LAN) and trying to access or port scan your computer on port 23 and seeing what happens.

johnwill · 05-01-2008, 01:59 PM

If you're behind a router, the place to close that port is the configuration of the router, trying to change it on your machine is wasting your time.

Perhaps the exact make/model of the router would help here, my guess is it has some sort of Telnet management interface.

cheescake · 05-01-2008, 06:27 PM

True johnwill, i didn't think about it that way.

Your router could have a telnet interface for remote administration and that is what your nmap is detecting

dj_kiwi · 05-02-2008, 01:30 AM

yep, more than likely, try

telnet://routerip:23

04-30-2008, 08:16 PM	#1 (permalink)
Davian Registered User Join Date: Feb 2006 Location: Jamaica Posts: 14 OS: XP Professional	How to disable telnet I did a port scan & the scan revealed that I a port open. The port is used by telnet which is disable in the services section. what else can I do to fully disable telnet?

04-30-2008, 08:23 PM	#2 (permalink)
TriggerFinger Mentor Hardware Team Join Date: Jan 2008 Location: LV, NV, USA Posts: 2,287 OS: DOS 6.0	Re: How to disable telnet hi Davian, telnet (AFAIK) uses port 23. close port 23 in your firewall. after closing the port, run port scanner again. __________________ DBAN - Memtest86+ - BartPE - Linux LiveCD list - ImgBurn - HDD Diagnostic Tools - Everest Last edited by TriggerFinger : 04-30-2008 at 08:24 PM.

05-01-2008, 07:47 AM	#3 (permalink)
Davian Registered User Join Date: Feb 2006 Location: Jamaica Posts: 14 OS: XP Professional	Re: How to disable telnet I tried that it didn't work. I am using Zone Alarm Internet security.

05-01-2008, 07:58 AM	#4 (permalink)
cheescake Registered User Join Date: Apr 2008 Location: NYC Posts: 38 OS: Microsoft Windows XP Professional Version 5.1.2600 Service Pack 2 Build 2600 My System	Re: How to disable telnet Try this... Start > Run > type Services.msc A windows should open up if you type it correctly. On the left pane you should see a list of services. Go down to Telnet and right-click it. Click properties so that a new windows opens. Look for something that says "Startup Type" and change it to disabled. Now look at the services status on the bottom of that windows and click disable. now backtrack by clicking OK/Apply then your all done __________________ Attitude is a little thing that makes a big difference. -Winston Churchill

05-01-2008, 08:14 AM	#5 (permalink)
dj_kiwi Registered User Join Date: Apr 2008 Location: Swansea - South Wales Posts: 120 OS: WinXP - Linux My System	Re: How to disable telnet are you port scanning on your LAN ? You should be fine behind a Router/Firewall... also try : www.nmapyourself.com __________________ Computer games dont kill people, people kill people!

05-01-2008, 08:27 AM	#6 (permalink)
TriggerFinger Mentor Hardware Team Join Date: Jan 2008 Location: LV, NV, USA Posts: 2,287 OS: DOS 6.0	Re: How to disable telnet what port scanner did you use? try nmap for windows http://download.insecure.org/nmap/di...4.60-setup.exe __________________ DBAN - Memtest86+ - BartPE - Linux LiveCD list - ImgBurn - HDD Diagnostic Tools - Everest

05-01-2008, 09:18 AM	#7 (permalink)
Davian Registered User Join Date: Feb 2006 Location: Jamaica Posts: 14 OS: XP Professional	Re: How to disable telnet That was the default setting Cheescake. Yes I am behind a router,NAT and firewall. I used http://probe.hackerwatch.org/probe/probe.asp and https://www.grc.com/x/ne.dll?rh1dkyd2. Both said I had Telnet open.

05-01-2008, 10:37 AM	#8 (permalink)
cheescake Registered User Join Date: Apr 2008 Location: NYC Posts: 38 OS: Microsoft Windows XP Professional Version 5.1.2600 Service Pack 2 Build 2600 My System	Re: How to disable telnet Try using netstat -aN to see if your computer is listening/established on port 23 on any interface If it is then you can rule out your hardware although if not then the issue is hardware since its not running. Also if you ave another computer to test with, you can get an outside IP address (perform this over WAN link, no LAN) and trying to access or port scan your computer on port 23 and seeing what happens. __________________ Attitude is a little thing that makes a big difference. -Winston Churchill

05-01-2008, 01:59 PM	#9 (permalink)
johnwill Manager, Networking Forums Join Date: Sep 2002 Location: S.E. Pennsylvania, US Posts: 27,300 OS: XP-Pro, Vista, Linux Blog Entries: 1	Re: How to disable telnet If you're behind a router, the place to close that port is the configuration of the router, trying to change it on your machine is wasting your time. Perhaps the exact make/model of the router would help here, my guess is it has some sort of Telnet management interface. __________________ If TSF has helped you, Tell us about it! or Donate to help keep the site up! Microsoft MVP - Windows Desktop Experience

05-01-2008, 06:27 PM	#10 (permalink)
cheescake Registered User Join Date: Apr 2008 Location: NYC Posts: 38 OS: Microsoft Windows XP Professional Version 5.1.2600 Service Pack 2 Build 2600 My System	Re: How to disable telnet True johnwill, i didn't think about it that way. Your router could have a telnet interface for remote administration and that is what your nmap is detecting __________________ Attitude is a little thing that makes a big difference. -Winston Churchill

05-02-2008, 01:30 AM	#11 (permalink)
dj_kiwi Registered User Join Date: Apr 2008 Location: Swansea - South Wales Posts: 120 OS: WinXP - Linux My System	Re: How to disable telnet yep, more than likely, try telnet://routerip:23 __________________ Computer games dont kill people, people kill people!