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Cannot telnet to a server from the ISA 2006 server

Posted on 2013-02-06
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Last Modified: 2013-02-07
Hi, i need to confirm that i can telnet to an external
server that sits behind an externla firewall.  We have a simple AD directory on one vlan using ISA 2006 as the proxy/ firewall that sits on our LAN. When from my client pc i run the telnet command to the external server it goes though our ISA server and then times out after hitting the router, we expect this because my client IP address has not been permitted access to teh external firewall however, when i log onto the ISA firewall who's IP address has been allowed through the external firewall it fails to connect using telnet. In fact, it can't even telnet to the router.

How do i enable telnet on the ISA? I'm confused because my client uses telnet and passes the ISA so why can't the ISA itself use telnet? Any help appreciated.
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Question by:Jason Thomas
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Author Comment

by:Jason Thomas
ID: 38859931
Anyone know how to write a batch file that i could parse my credentails and use the telnet command perhaps?
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Expert Comment

by:Suliman Abu Kharroub
ID: 38861388
Do you have an access rule from localhost to external allowing telnet protocol for all users ?
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Author Comment

by:Jason Thomas
ID: 38861395
Hi, no I do not, not from local host. Do you have a rough idea on how to create that?
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Accepted Solution

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Suliman Abu Kharroub earned 500 total points
ID: 38861425
It is as same as creating access policies on ISA server,,, just select "localhost" instead of internal in the from field

http://www.youtube.com/watch?v=WcLCrk-bngc

Select localhost on the from field
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Author Comment

by:Jason Thomas
ID: 38863037
Hi mate,

I puit the rule in but get the same failure. Watched the utube vid to ensure was done corretly. What i'm thinking is that when i run up a command prompt and run teh telnet command is it actually using the ISA software to get out?
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Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

 
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Author Comment

by:Jason Thomas
ID: 38863232
When i check the ISA logs it states "denied connection - reason - unidentified IP traffic (UDP:23). And that it is hitting our last default rule but doesn't make any sense because I have the allow telnet (any port) rule as number 1 in the list from local host to anywhere?
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Expert Comment

by:Suliman Abu Kharroub
ID: 38863325
Which protocol do you select on the rule ? telnet client ?
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Author Comment

by:Jason Thomas
ID: 38863408
got it working, many thanks dude.
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Author Closing Comment

by:Jason Thomas
ID: 38863412
thank you
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Expert Comment

by:Suliman Abu Kharroub
ID: 38863418
You are welcome!
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Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

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