I came across that one also, however they appear to be having problems because I can't open their website.
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Can you recommend an online telnet tool?
Is there a website where I can send external telnet commands to our servers? I want to check that the firewall is configured correctly and hence is allowing certain ports in.
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Answers
Sounds like you need to host a box externally and use nmap.
I use a combination of nmap (for manual tests) and telnet and nagios for automated tests from a box at home.
I'm not aware of any websites that offer such a service, but you can run a linux server with a relatively low spec running nagios and nmap for free....
nagios - http://www.nagios.org
nmap - http://www.insecure.org
Nagios can test (at whatever frequency you want) service statuses, port statuses, pingable hosts - the options are vast.
nmap can test whether ports are open/closed/filtered and also fingerprint the software versions of listening services on the ports (nmap -sS -sV mail.yourdomain.com -p 25)
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by: woolmilkporcPosted on 2009-04-29 at 03:20:35ID: 24258793
This one looks okay -
http://www.hq42.net/net_t