Script to check availability of service based on port.

Hello,
Could you please provide me with script to check the availability of vpn service for example based on port i mean like telnet command then to send email if it fails ?
Thanks.
Mahmoud NoubaniAsked:
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Dirk KotteSECommented:
would suggest using nagios/icinga/prtg for this job.
SSL-VPN and PPTP should be possible.
But monitoring IPsec-VPN is not so simple, because not TCP is used for session initiation.
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