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Status Not under consideration
Workspace z/OS
Categories Communications Server
Created by Guest
Created on May 2, 2018

RELATED IDEAS

SOCKS Configuration - Limitation

We have a problem with the SOCKS configuration in Mainframe that dont allow the use of DNS on the FTP server destination and only allow the use of IP Address.

My concern here is that the network department setup rules on the SOCKS Server (the one we use on mainframe SOCKS configuration file) and generally they use DNS not IP Address for the FTP Server destinations but the mainframe side have the limitation that cant use DNS for the FTP Server destination they need to setup instead the IP Address and need to be specific not general and wide open IP Address.

Motivated to my previous explanation we need to worried if the IP address of the FTP Server destination change because the FTP client on the mainframe side will fail and not because the SOCKS configuration on Mainframe but because the rules that was setup on the SOCKS Server will not match anymore and therefore dont allow the FTP connection.

The Port is also a limitation that only alow the use of the Port 1080 and sometimes this is already restricted.

Idea priority High
  • Guest
    Reply
    |     May 12, 2022
    This item is unlikely to be given high enough priority to be placed into product plan.
  • Guest
    Reply
    |     Nov 8, 2019

    We would like to see the enhancement include support for FQDN as described in
    https://tools.ietf.org/html/rfc1928
    Specifically Section 4. Requests ATYP=3, further described in Section 5. X'03'
    the address field contains a fully-qualified domain name. The first
    octet of the address field contains the number of octets of name that
    follow, there is no terminating NUL octet.

    Our issue with the present implementation in zOS is that only the IP Address can be configured in SOCKSCONFIGFILE. Our FTP client jobs have the FQDN coded (I presume for similar reasons to the original RFE request) and DNS resolution is performed before the lookup by address in the file so it can be forwarded on to the SOCKS server. We're attempting to isolate our internal DNS from external name resolution and therefore require the FQDN to be passed to the SOCKS5 server on the network edge for resolution and it's use in the proxy connection to external servers.

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