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Dave, > Telnet on 23 should be OK but Client Access and Mocha aren't really Telnet, > are they? Yes they are, but a 5250 flavor of telnet as opposed to VT100 or whatever. Also note that CA needs additional ports, as linked in Wilt's reply. Other clients such as Mocha or TN5250 et al will likely need only the single port. If not using VPN, I'd recommend *not* using port 23 on the public side but some other port mapped to port 23 directed to the 400. Then be sure to use a telnet exit program to validate connections. And IP filtering at the firewall to limit access to authorized sources. Doug
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