So you are going to allow ANYONE through your firewall on the ACS ports - 
no security except user name and password ?
I hope you have good password policies and all default user profiles 
passwords have been changed.
Would not be my recommendation.
Cheers
Don Brown
From:   "Steinmetz, Paul via MIDRANGE-L" <midrange-l@xxxxxxxxxxxxxxxxxx>
To:     "'Midrange Systems Technical Discussion'" 
<midrange-l@xxxxxxxxxxxxxxxxxx>
Cc:     "Steinmetz, Paul" <PSteinmetz@xxxxxxxxxx>
Date:   21/04/2020 07:20 AM
Subject:        Ports needed for ACS when working from home over VPN
Sent by:        "MIDRANGE-L" <midrange-l-bounces@xxxxxxxxxxxxxxxxxx>
We are now starting to allow users to WFH without using RDP, via VPN.
Many ports need to be enabled on the firewall for remote access.
I found below link, not sure if this was a complete list.
TCP/IP Ports Required for IBM i Access and Related Functions
https://www.ibm.com/support/pages/tcpip-ports-required-ibm-i-access-and-related-functions
The following table lists the ports that IBM i Access and related 
functions use for communication with the IBM i OS System:
*
o    PC Function
*         Server Name
Port Non-SSL
Port SSL
*         Server Mapper
*         as-svrmap
*         449
*         ---
*         License Management
*         as-central
*         8470
*         9470
*         Database Access
*         as-database
*         8471
*         9471
*         Data Queues
*         as-dtaq
*         8472
*         9472
*         IFS Access using
System i Navigator
*         as-file
*         8473
*         9473
*         Network Printers
*         as-netprt
*         8474
*         9474
*         Remote Command
*         as-rmtcmd
*         8475
*         9475
*         Signon Verification
*         as-signon
*         8476
*         9476
*         Telnet (5250 Emulation)
*         telnet
*         23
*         992
Navigator for i (web)
as-nav
2004
2005
*         HTTP Administration
*         as-admin
*         2001
*         2010
*         POP3 (MAPI)
*         pop3
*         5010
*         ---
*         Management Central
*         as-mgtc >
*         5555 and 5544
*         5566 and 5577
*         Ultimedia Services
*         as-usf
*         8480
*         9480
*         DDM/DRDA
*         DDM/DRDA
*         446
*         448
*         NetServer
*         netbios >
*         137
*         ---
*         NetServer
*         CIFS
*         445
*         ---
*         NetServer
*         netbios >
*         139
*         ---
*         Service Tools Server
*         as-sts
*         3000
*         ---
DHCP Monitor
---
---
942
*         RUNRMTCMD
*         REXEC
*         512
*         ---
If any of the above ports are restricted using a firewall or any other 
mechanism, IBM i Access or related functions may fail to operate. For 
assistance with configuring ports or working with a firewall beyond the 
above information, contact the firewall provider or obtain a consulting 
agreement.
Note:
The following ports are common to most IBM i Access Client products such 
as ODBC, Telnet and other specific functions:
Port 449 is used to look up service by name and return the port number.
Ports 8470 and 9470(TLS/SSL) are used for host code page translation 
tables and licensing functions.
Ports 8475 and 9475(TLS/SSL) are used to check for application 
administration restrictions.
Ports 8476 and 9476(TLS/SSL) are used for checking signon verification to 
authenticate.
depending on your needs you may only need the above ports and the port(s) 
for your function/application.
Thank You
_____
Paul Steinmetz
IBM i Systems Administrator
Pencor Services, Inc.
462 Delaware Ave
Palmerton Pa 18071
610-826-9117 work
610-826-9188 fax
610-349-0913 cell
610-377-6012 home
psteinmetz@xxxxxxxxxx<mailto:psteinmetz@xxxxxxxxxx>
http://www.pencor.com/
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