I can connect locally to iSeries via telnet

25 pts.
AS/400 connectivity
iseries v5r4
I can connect locally using telnet, but cannot do it from the outside world. Any pointers out there would be appreciated. Thanks, Bob

Software/Hardware used:
AS400 520 V5R4

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You don’t give many details on your overall setup.

Even so, I assume that you’re connecting to the Internet via a broadband router with NAT.
If this is correct, you need to configure “port forwarding” in the router that connects to Internet.

Basically, you need to tell you’re Internet access router that the telnet requests (port 23) you are willing to let get into you’re network, should be forwarded to the machine you’re trying to reach from the outside.

This is a simple process but router specific.
If you know what you’re doing, you can get some help here¬†about port forwarding.

Once more, you must know what you are doing and configure it in a safe manner. Giving telnet access from the outside of this network will put it in risk. You should consider changing from telnet to ssh which is more secure.

Please post back if you have any further questions.

Discuss This Question: 6  Replies

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  • TomLiotta
    ...but cannot do it from the outside world. "Outside" of what? Normally, you'd think in terms of having two systems with cables that each attach to some 'device'. That might be a single device that has two cables, one for each system, attached to it; it might be two devices that each have a cable from one system plus another cable that runs between the two devices; or it might be two devices that each have a cable from one system plus any number of cables and other devices connected between them. Regardless, "inside" and "outside" can have meanings that change depending on various components. It might mean that you can telnet from a PC in the server room to one of the servers, so you are "inside" the server room. The 'device' might then be a dumb hub or a switch. Or maybe you can telnet from outside the server room but not from the other end of the building. There might be a router or bridge device that links small local-area networks for each business unit into building sized local-area network. Or maybe you can't telnet from outside the building, i.e., from a warehouse building on the same site. Multiple routers and/or bridges might connect areas of a large campus into a functional local network. Or it means that you can't telnet from some other business' network or from your home through your home's ISP across the internet into a server at your business. Good! That's how it's supposed to work. (That is, that's how it's supposed to "not work".) Nowadays, it should be expected that simple telnet can't get to a business server. There are technologies that can help connect through that obstacle, e.g., VPN. So, what is the description of your circumstances? Tom
    125,585 pointsBadges:
  • jinteik
    or is there even a firewall inside your network that blocks your traffic?
    18,995 pointsBadges:
  • TomLiotta
    ...you need to tell you're Internet access router... But be aware that you can only do that if you own and control each device that may be blocking telnet. You might have a basic ISP home account, for example, where the ISP will block most incoming server ports. In such a case, you might need to upgrade (i.e., "pay more per month") your account and ensure the ISP unblocks the ports. Generally, it's a pretty bad idea just to open telnet into your network. Tom
    125,585 pointsBadges:
  • Batman47
    From a DOS prompt, try the command: CWBPING systemname This should give you more information as to what the problem is.
    1,050 pointsBadges:
  • Jaymz69
    I use GoToMyPc to a host PC
    765 pointsBadges:
  • slack400
    Go talk to your network administrator.
    2,740 pointsBadges:

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