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Old 06-28-2016, 10:57 AM   #1
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Access control

I use Redhat 6.5 server , I just would like to check the security issue of this service .

I know ssh , ftp , telnet is the typical services to remote access method to access the server , may I know is there other method could be used to access from remote , how can I check is there any service is opened for remote access ?

Old 06-28-2016, 11:03 AM   #2
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You definitely do not want run telnet server, it is as insecure as it gets. Telnet client may be useful to probe ports/daemons.
Old 06-28-2016, 11:47 AM   #3
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I would say, quite bluntly, that you should first(!) set up OpenVPN ... with unique digital certificates, not passwords == PSKs ... and to arrange for all other services to "listen" only to it, so that there are no other ports open. (And, as I describe in my thread about "Dwarvish Doors" on the Security forum, you can conceal the fact that it is open.)

Authorized users, having first connected via VPN, can then use other services like SSH.

Unauthorized users and "kiddies" find: "nothing." Even if they can detect that the port exists, they can't get through it no matter how hard they try. (Even if they steal a laptop, that certificate can be made to drop dead.) There is "a smooth, impenetrable, featureless wall."


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