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We're having some discussions about what would be the most secure way to
provide users traditional green screen access across a network while
protecting the security of the network.

Protecting the security of the network from what? Are there other entry points to the network besides the computers that are directly connected to it?

For example, is it connected to the Internet? or is there wireless access?

- Telnet to well know ports (23,25,80) is blocked.

Blocked from where?  Not from the network itself, surely?

- The applications involved can't be changed. (e.g. to make them web
friendly, must be green screen)

Why would this matter?

- Only network security is at issue, once they sign on, the iSeries/400
takes over.

Ummm... it still communicates over the network after the sign-on. I don't understand what the point of this statement is.

- Would prefer no user side software be installed but, if required, it
should be minimal.

I thought you were protecting the network from the outside, but this statement makes me think otherwise. Are you wanting to allow someone from the outside to access your iSeries? If so, there are really two secure alternatives: SSL telnet and VPN.

Surely the people on your network already have the software they need to access the iSeries.

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