![Page 1: How to Secure Mainframe TCP/IP - Stu · PDF fileHow to Secure Mainframe TCP/IP Stu Henderson stu@stuhenderson.com 5702 Newington Road Bethesda, MD 20816](https://reader034.vdocument.in/reader034/viewer/2022051405/5a78fd4b7f8b9a77088e41a6/html5/thumbnails/1.jpg)
How to Secure Mainframe TCP/IP
Stu Henderson [email protected]
5702 Newington Road www.stuhenderson.com
Bethesda, MD 20816 (301) 229-7187
![Page 2: How to Secure Mainframe TCP/IP - Stu · PDF fileHow to Secure Mainframe TCP/IP Stu Henderson stu@stuhenderson.com 5702 Newington Road Bethesda, MD 20816](https://reader034.vdocument.in/reader034/viewer/2022051405/5a78fd4b7f8b9a77088e41a6/html5/thumbnails/2.jpg)
Stuart Henderson (c) 2014 www.stuhenderson.com 301-229-7187
2
Most mainframe data centers now have at
least one mainframe connected to TCP/IP, often with
some connection to the Internet. While the z/OS
software gives a large number of tools to secure
these connections, these tools often are not used. (If
you think you don't use TCP/IP with your z/OS
systems, try issuing the TSO command NETSTAT.)
In this session, Stu explains IP and TCP
clearly, describes the security risks and the security
tools you already have for free with z/OS, and shows
you how to go about implementing the tools. You will
learn why z/OS is considered the "most securable
TCP/IP platform available". You will also learn how to
make yours effectively secured.
ABSTRACT
![Page 3: How to Secure Mainframe TCP/IP - Stu · PDF fileHow to Secure Mainframe TCP/IP Stu Henderson stu@stuhenderson.com 5702 Newington Road Bethesda, MD 20816](https://reader034.vdocument.in/reader034/viewer/2022051405/5a78fd4b7f8b9a77088e41a6/html5/thumbnails/3.jpg)
Stuart Henderson (c) 2014 www.stuhenderson.com 301-229-7187
3
1. Introduction
2. The Risks
3. The Protections
4. Summary: Call to Action
AGENDA
![Page 4: How to Secure Mainframe TCP/IP - Stu · PDF fileHow to Secure Mainframe TCP/IP Stu Henderson stu@stuhenderson.com 5702 Newington Road Bethesda, MD 20816](https://reader034.vdocument.in/reader034/viewer/2022051405/5a78fd4b7f8b9a77088e41a6/html5/thumbnails/4.jpg)
1. Introduction
Stuart Henderson (c) 2014 www.stuhenderson.com 301-229-7187
4
TCP/IP is:
How a program on one
computer shares data with a
program on a different
computer
Transmission Control Protocol
/ Internet Protocol
![Page 5: How to Secure Mainframe TCP/IP - Stu · PDF fileHow to Secure Mainframe TCP/IP Stu Henderson stu@stuhenderson.com 5702 Newington Road Bethesda, MD 20816](https://reader034.vdocument.in/reader034/viewer/2022051405/5a78fd4b7f8b9a77088e41a6/html5/thumbnails/5.jpg)
An IP Address Is
Stuart Henderson (c) 2014 www.stuhenderson.com 301-229-7187
5
A number like: 206.188.192.243
Contained within each TCP/IP message
Used to route each message to its destination computer
Often mapped to a DNS name like www.stuhenderson.com
![Page 6: How to Secure Mainframe TCP/IP - Stu · PDF fileHow to Secure Mainframe TCP/IP Stu Henderson stu@stuhenderson.com 5702 Newington Road Bethesda, MD 20816](https://reader034.vdocument.in/reader034/viewer/2022051405/5a78fd4b7f8b9a77088e41a6/html5/thumbnails/6.jpg)
IP Address Routes the
Message to a Computer
Stuart Henderson (c) 2014 www.stuhenderson.com 301-229-7187
6
IP ADDRESS
206.188.192.243
![Page 7: How to Secure Mainframe TCP/IP - Stu · PDF fileHow to Secure Mainframe TCP/IP Stu Henderson stu@stuhenderson.com 5702 Newington Road Bethesda, MD 20816](https://reader034.vdocument.in/reader034/viewer/2022051405/5a78fd4b7f8b9a77088e41a6/html5/thumbnails/7.jpg)
IP Address Routes the
Message
Stuart Henderson (c) 2014 www.stuhenderson.com 301-229-7187
7
IP ADDRESS
206.188.192.243
![Page 8: How to Secure Mainframe TCP/IP - Stu · PDF fileHow to Secure Mainframe TCP/IP Stu Henderson stu@stuhenderson.com 5702 Newington Road Bethesda, MD 20816](https://reader034.vdocument.in/reader034/viewer/2022051405/5a78fd4b7f8b9a77088e41a6/html5/thumbnails/8.jpg)
You Can’t Control
Stuart Henderson (c) 2014 www.stuhenderson.com 301-229-7187
8
The route your message takes as it is
passed from computer to computer
over the Internet.
Anyone in charge of any of those
computers is able to view your
message as it gets passed on.
![Page 9: How to Secure Mainframe TCP/IP - Stu · PDF fileHow to Secure Mainframe TCP/IP Stu Henderson stu@stuhenderson.com 5702 Newington Road Bethesda, MD 20816](https://reader034.vdocument.in/reader034/viewer/2022051405/5a78fd4b7f8b9a77088e41a6/html5/thumbnails/9.jpg)
Length of IP Message
To IP Address
From IP Address
IP Message Layout
IP Message
Data
![Page 10: How to Secure Mainframe TCP/IP - Stu · PDF fileHow to Secure Mainframe TCP/IP Stu Henderson stu@stuhenderson.com 5702 Newington Road Bethesda, MD 20816](https://reader034.vdocument.in/reader034/viewer/2022051405/5a78fd4b7f8b9a77088e41a6/html5/thumbnails/10.jpg)
The Port Number
Stuart Henderson (c) 2014 www.stuhenderson.com 301-229-7187
10
Identifies an application like email
or FTP
Is contained in the message itself
Is used to route the message once
it arrives at its destination
computer
![Page 11: How to Secure Mainframe TCP/IP - Stu · PDF fileHow to Secure Mainframe TCP/IP Stu Henderson stu@stuhenderson.com 5702 Newington Road Bethesda, MD 20816](https://reader034.vdocument.in/reader034/viewer/2022051405/5a78fd4b7f8b9a77088e41a6/html5/thumbnails/11.jpg)
To Port #
From Port #
IP Message & TCP Packet
Layout
IP Message
Data
TCP
Data
IP MESSAGE
TCP PACKET
![Page 12: How to Secure Mainframe TCP/IP - Stu · PDF fileHow to Secure Mainframe TCP/IP Stu Henderson stu@stuhenderson.com 5702 Newington Road Bethesda, MD 20816](https://reader034.vdocument.in/reader034/viewer/2022051405/5a78fd4b7f8b9a77088e41a6/html5/thumbnails/12.jpg)
To Port #
From Port #
IP Message Data
Contains TCP Packet Data
IP Message
Data
TCP
Data
![Page 13: How to Secure Mainframe TCP/IP - Stu · PDF fileHow to Secure Mainframe TCP/IP Stu Henderson stu@stuhenderson.com 5702 Newington Road Bethesda, MD 20816](https://reader034.vdocument.in/reader034/viewer/2022051405/5a78fd4b7f8b9a77088e41a6/html5/thumbnails/13.jpg)
Stuart Henderson (c) 2014 www.stuhenderson.com 301-229-7187
13
25 Email
Port
23 Remote
Login
Port
20 FTP
Port
# Other 1
TCP Ports
# Other 2
![Page 14: How to Secure Mainframe TCP/IP - Stu · PDF fileHow to Secure Mainframe TCP/IP Stu Henderson stu@stuhenderson.com 5702 Newington Road Bethesda, MD 20816](https://reader034.vdocument.in/reader034/viewer/2022051405/5a78fd4b7f8b9a77088e41a6/html5/thumbnails/14.jpg)
To Port 25
IP Message
Arrives
TCP
Data
25 Email
23 Remote Login
20 FTP
TCP PACKET
![Page 15: How to Secure Mainframe TCP/IP - Stu · PDF fileHow to Secure Mainframe TCP/IP Stu Henderson stu@stuhenderson.com 5702 Newington Road Bethesda, MD 20816](https://reader034.vdocument.in/reader034/viewer/2022051405/5a78fd4b7f8b9a77088e41a6/html5/thumbnails/15.jpg)
IP Address and DNS
Name
Stuart Henderson (c) 2014 www.stuhenderson.com 301-229-7187
15
An IP Address is a number used to
route an IP message to a given
computer:
192.168.1.1
Can often be mapped to a DNS
name like www.stuhenderson.com
![Page 16: How to Secure Mainframe TCP/IP - Stu · PDF fileHow to Secure Mainframe TCP/IP Stu Henderson stu@stuhenderson.com 5702 Newington Road Bethesda, MD 20816](https://reader034.vdocument.in/reader034/viewer/2022051405/5a78fd4b7f8b9a77088e41a6/html5/thumbnails/16.jpg)
Port Number
Stuart Henderson (c) 2014 www.stuhenderson.com 301-229-7187
16
Routes a message to the correct application (like email or file transfer)
For example, port 25 is often used for email.
Once an IP message arrives at the computer it is addressed to, TCP looks at the Port Number and hands the message to the program that handles that port number
![Page 17: How to Secure Mainframe TCP/IP - Stu · PDF fileHow to Secure Mainframe TCP/IP Stu Henderson stu@stuhenderson.com 5702 Newington Road Bethesda, MD 20816](https://reader034.vdocument.in/reader034/viewer/2022051405/5a78fd4b7f8b9a77088e41a6/html5/thumbnails/17.jpg)
Stuart Henderson (c) 2014 www.stuhenderson.com 301-229-7187
17
Overall Flow
www.stuhenderson.com to
206.188.192.243
25 Email
23 Remote Login
20 FTP
![Page 18: How to Secure Mainframe TCP/IP - Stu · PDF fileHow to Secure Mainframe TCP/IP Stu Henderson stu@stuhenderson.com 5702 Newington Road Bethesda, MD 20816](https://reader034.vdocument.in/reader034/viewer/2022051405/5a78fd4b7f8b9a77088e41a6/html5/thumbnails/18.jpg)
How to Learn What’s Up
Stuart Henderson (c) 2014 www.stuhenderson.com 301-229-7187
18
The TSO command NETSTAT will
tell you what TCP/IP connections
are running
Tells you:
To and from IP addresses
To and from Ports
Program names (such as DB2,
CICS, FTP, TN3270 MQ Series)
![Page 19: How to Secure Mainframe TCP/IP - Stu · PDF fileHow to Secure Mainframe TCP/IP Stu Henderson stu@stuhenderson.com 5702 Newington Road Bethesda, MD 20816](https://reader034.vdocument.in/reader034/viewer/2022051405/5a78fd4b7f8b9a77088e41a6/html5/thumbnails/19.jpg)
Are Mainframes at Risk?
Stuart Henderson (c) 2014 www.stuhenderson.com 301-229-7187
19
Peter Hager notes a website with
over 700 mainframes providing
TN3270 access over the Internet.
Every day more IP addresses are
added
More than half allow access
without encryption
![Page 20: How to Secure Mainframe TCP/IP - Stu · PDF fileHow to Secure Mainframe TCP/IP Stu Henderson stu@stuhenderson.com 5702 Newington Road Bethesda, MD 20816](https://reader034.vdocument.in/reader034/viewer/2022051405/5a78fd4b7f8b9a77088e41a6/html5/thumbnails/20.jpg)
Is Your Mainframe Here?
Stuart Henderson (c) 2014 www.stuhenderson.com 301-229-7187
20
Other mainframes listed on this
website enable logons with clear
text connection
(Peter’s website has more info on
risks of BYOD, letting users connect
to your mainframe from their
smartphones over TCP/IP)
![Page 21: How to Secure Mainframe TCP/IP - Stu · PDF fileHow to Secure Mainframe TCP/IP Stu Henderson stu@stuhenderson.com 5702 Newington Road Bethesda, MD 20816](https://reader034.vdocument.in/reader034/viewer/2022051405/5a78fd4b7f8b9a77088e41a6/html5/thumbnails/21.jpg)
2. The Risks
Stuart Henderson (c) 2014 www.stuhenderson.com 301-229-7187
21
Copying Sensitive Data
Unauthorized Port Opening
Port Scanning
DOS (Denial of Service)
Hijacking a Session
![Page 22: How to Secure Mainframe TCP/IP - Stu · PDF fileHow to Secure Mainframe TCP/IP Stu Henderson stu@stuhenderson.com 5702 Newington Road Bethesda, MD 20816](https://reader034.vdocument.in/reader034/viewer/2022051405/5a78fd4b7f8b9a77088e41a6/html5/thumbnails/22.jpg)
Copying Sensitive Data
Stuart Henderson (c) 2014 www.stuhenderson.com 301-229-7187
22
Passwords, PII, PCI, HIPAA…
You can’t control the route your
message takes over the Internet
Protection: Encryption
![Page 23: How to Secure Mainframe TCP/IP - Stu · PDF fileHow to Secure Mainframe TCP/IP Stu Henderson stu@stuhenderson.com 5702 Newington Road Bethesda, MD 20816](https://reader034.vdocument.in/reader034/viewer/2022051405/5a78fd4b7f8b9a77088e41a6/html5/thumbnails/23.jpg)
Unauthorized Port
Opening
Stuart Henderson (c) 2014 www.stuhenderson.com 301-229-7187
23
Unauthorized program opens a
port, listens for invites
The mainframe Internet hack in
Europe
Protection: Block the Ports and
Packet Filtering
![Page 24: How to Secure Mainframe TCP/IP - Stu · PDF fileHow to Secure Mainframe TCP/IP Stu Henderson stu@stuhenderson.com 5702 Newington Road Bethesda, MD 20816](https://reader034.vdocument.in/reader034/viewer/2022051405/5a78fd4b7f8b9a77088e41a6/html5/thumbnails/24.jpg)
Port Scanning
Stuart Henderson (c) 2014 www.stuhenderson.com 301-229-7187
24
Hacker maps your system by
pinging every port to see what
software is behind it
Finds port backed by insecure
software
Protection: Intrusion Detection
(Recognizes Patterns) and
Software Quality
![Page 25: How to Secure Mainframe TCP/IP - Stu · PDF fileHow to Secure Mainframe TCP/IP Stu Henderson stu@stuhenderson.com 5702 Newington Road Bethesda, MD 20816](https://reader034.vdocument.in/reader034/viewer/2022051405/5a78fd4b7f8b9a77088e41a6/html5/thumbnails/25.jpg)
DOS (Denial of Service)
Stuart Henderson (c) 2014 www.stuhenderson.com 301-229-7187
25
Two Types:
Flood Attacks (Protection: Powerful
Computer, Intrusion Detection)
Buffer Overflow (Protection:
Software Quality Assurance)
![Page 26: How to Secure Mainframe TCP/IP - Stu · PDF fileHow to Secure Mainframe TCP/IP Stu Henderson stu@stuhenderson.com 5702 Newington Road Bethesda, MD 20816](https://reader034.vdocument.in/reader034/viewer/2022051405/5a78fd4b7f8b9a77088e41a6/html5/thumbnails/26.jpg)
Hijacking a Session
Stuart Henderson (c) 2014 www.stuhenderson.com 301-229-7187
26
You can’t predict the route your message takes over the Internet
You think you’re talking to the other computer, but you’re actually talking to the hacker’s computer.
Protection: Encryption and Digital Certificates
![Page 27: How to Secure Mainframe TCP/IP - Stu · PDF fileHow to Secure Mainframe TCP/IP Stu Henderson stu@stuhenderson.com 5702 Newington Road Bethesda, MD 20816](https://reader034.vdocument.in/reader034/viewer/2022051405/5a78fd4b7f8b9a77088e41a6/html5/thumbnails/27.jpg)
3. The Protections
Stuart Henderson (c) 2014 www.stuhenderson.com 301-229-7187
27
Configuration Files
SERVAUTH
Encryption / Digital Certificates
PAGENT (Policy Agent)
![Page 28: How to Secure Mainframe TCP/IP - Stu · PDF fileHow to Secure Mainframe TCP/IP Stu Henderson stu@stuhenderson.com 5702 Newington Road Bethesda, MD 20816](https://reader034.vdocument.in/reader034/viewer/2022051405/5a78fd4b7f8b9a77088e41a6/html5/thumbnails/28.jpg)
Configuration Files
Stuart Henderson (c) 2014 www.stuhenderson.com 301-229-7187
28
For TCP/IP itself
For FTP, Policy Agent, others
Provide for:
Blocking of ports
SERVAUTH calls
Encryption
Client authentication
Intrusion detection
![Page 29: How to Secure Mainframe TCP/IP - Stu · PDF fileHow to Secure Mainframe TCP/IP Stu Henderson stu@stuhenderson.com 5702 Newington Road Bethesda, MD 20816](https://reader034.vdocument.in/reader034/viewer/2022051405/5a78fd4b7f8b9a77088e41a6/html5/thumbnails/29.jpg)
SERVAUTH
Stuart Henderson (c) 2014 www.stuhenderson.com 301-229-7187
29
Resource Class with RACF, ACF2,
TopSecret
Restricts access to:
Ports and IP addresses
FTP
TCP/IP itself
TN3270
Other
Specified in configuration files
![Page 30: How to Secure Mainframe TCP/IP - Stu · PDF fileHow to Secure Mainframe TCP/IP Stu Henderson stu@stuhenderson.com 5702 Newington Road Bethesda, MD 20816](https://reader034.vdocument.in/reader034/viewer/2022051405/5a78fd4b7f8b9a77088e41a6/html5/thumbnails/30.jpg)
Encryption / Digital
Certificates
Stuart Henderson (c) 2014 www.stuhenderson.com 301-229-7187
30
SSL / TLS application transparent
(Any application can invoke it
based on configuration file)
Protects Data, Also: Client
Authentication, Non-Repudiation
Digital Certificates should be in
RACF, ACF2, TopSecret
![Page 31: How to Secure Mainframe TCP/IP - Stu · PDF fileHow to Secure Mainframe TCP/IP Stu Henderson stu@stuhenderson.com 5702 Newington Road Bethesda, MD 20816](https://reader034.vdocument.in/reader034/viewer/2022051405/5a78fd4b7f8b9a77088e41a6/html5/thumbnails/31.jpg)
PAGENT (Policy Agent)
Stuart Henderson (c) 2014 www.stuhenderson.com 301-229-7187
31
A Firewall For the Mainframe
Free with z/OS
![Page 32: How to Secure Mainframe TCP/IP - Stu · PDF fileHow to Secure Mainframe TCP/IP Stu Henderson stu@stuhenderson.com 5702 Newington Road Bethesda, MD 20816](https://reader034.vdocument.in/reader034/viewer/2022051405/5a78fd4b7f8b9a77088e41a6/html5/thumbnails/32.jpg)
PAGENT Functions
Stuart Henderson (c) 2014 www.stuhenderson.com 301-229-7187
32
IPSEC (Port Blocking and VPN)
Encryption
Intrusion Detection
Packet Filtering
![Page 33: How to Secure Mainframe TCP/IP - Stu · PDF fileHow to Secure Mainframe TCP/IP Stu Henderson stu@stuhenderson.com 5702 Newington Road Bethesda, MD 20816](https://reader034.vdocument.in/reader034/viewer/2022051405/5a78fd4b7f8b9a77088e41a6/html5/thumbnails/33.jpg)
4. Summary: Call to
Action
Stuart Henderson (c) 2014 www.stuhenderson.com 301-229-7187
33
Use TSO NETSTAT to learn what is
running
Is PAGENT running?
What else is running?
![Page 34: How to Secure Mainframe TCP/IP - Stu · PDF fileHow to Secure Mainframe TCP/IP Stu Henderson stu@stuhenderson.com 5702 Newington Road Bethesda, MD 20816](https://reader034.vdocument.in/reader034/viewer/2022051405/5a78fd4b7f8b9a77088e41a6/html5/thumbnails/34.jpg)
4. Summary: Call to
Action
Stuart Henderson (c) 2014 www.stuhenderson.com 301-229-7187
34
Review configuration files:
DB2: DSNZPARM
CICS: DFHSIT, TCPIPSERVICE
TCP/IP: PROFILE, TCPDATA
FTP: FTPDATA
TN3270 same as TCP/IP
…
Change control on configuration files (NewEra’s Image Focus and The Control Editor)
![Page 35: How to Secure Mainframe TCP/IP - Stu · PDF fileHow to Secure Mainframe TCP/IP Stu Henderson stu@stuhenderson.com 5702 Newington Road Bethesda, MD 20816](https://reader034.vdocument.in/reader034/viewer/2022051405/5a78fd4b7f8b9a77088e41a6/html5/thumbnails/35.jpg)
4. Summary: Call to
Action
Stuart Henderson (c) 2014 www.stuhenderson.com 301-229-7187
35
Who decides what data to
encrypt?
How do they decide?
What knowledge is relevant?
![Page 36: How to Secure Mainframe TCP/IP - Stu · PDF fileHow to Secure Mainframe TCP/IP Stu Henderson stu@stuhenderson.com 5702 Newington Road Bethesda, MD 20816](https://reader034.vdocument.in/reader034/viewer/2022051405/5a78fd4b7f8b9a77088e41a6/html5/thumbnails/36.jpg)
4. Summary: Call to
Action
Stuart Henderson (c) 2014 www.stuhenderson.com 301-229-7187
36
Review Policy Agent configuration
file
It points to other configuration files
for specific functions
Which functions do you want?
![Page 37: How to Secure Mainframe TCP/IP - Stu · PDF fileHow to Secure Mainframe TCP/IP Stu Henderson stu@stuhenderson.com 5702 Newington Road Bethesda, MD 20816](https://reader034.vdocument.in/reader034/viewer/2022051405/5a78fd4b7f8b9a77088e41a6/html5/thumbnails/37.jpg)
4. Summary: Call to
Action
Stuart Henderson (c) 2014 www.stuhenderson.com 301-229-7187
37
Review port control
How do you block the ports?
Who decides?
![Page 38: How to Secure Mainframe TCP/IP - Stu · PDF fileHow to Secure Mainframe TCP/IP Stu Henderson stu@stuhenderson.com 5702 Newington Road Bethesda, MD 20816](https://reader034.vdocument.in/reader034/viewer/2022051405/5a78fd4b7f8b9a77088e41a6/html5/thumbnails/38.jpg)
4. Summary: Call to
Action
Stuart Henderson (c) 2014 www.stuhenderson.com 301-229-7187
38
Watch red flags for auditors:
No baseline documents
DSO doesn’t know how TCP/IP is secured
No encryption over passwords
No change control
No risk assessment
Not using PAGENT
Digital certificates not in RACF, ACF2, TopSecret
![Page 39: How to Secure Mainframe TCP/IP - Stu · PDF fileHow to Secure Mainframe TCP/IP Stu Henderson stu@stuhenderson.com 5702 Newington Road Bethesda, MD 20816](https://reader034.vdocument.in/reader034/viewer/2022051405/5a78fd4b7f8b9a77088e41a6/html5/thumbnails/39.jpg)
4. Summary: Call to
Action
Stuart Henderson (c) 2014 www.stuhenderson.com 301-229-7187
39
Review the risks listed above
Use the tools listed above to manage the risks
Ensure change control
Clarify who is responsible, who has authority
![Page 40: How to Secure Mainframe TCP/IP - Stu · PDF fileHow to Secure Mainframe TCP/IP Stu Henderson stu@stuhenderson.com 5702 Newington Road Bethesda, MD 20816](https://reader034.vdocument.in/reader034/viewer/2022051405/5a78fd4b7f8b9a77088e41a6/html5/thumbnails/40.jpg)
For More Information
Stuart Henderson (c) 2014 www.stuhenderson.com 301-229-7187
40
ACF2, TopSecret Manuals from CA Technologies
RACF and z/OS Communications Server Manuals (www.ibm.com/servers/eserver/zseries/zos/bkserv/ )
Articles on FTP Security and SERVAUTH and Other Topics at www.stuhenderson.com/XARTSTXT.HTM
![Page 41: How to Secure Mainframe TCP/IP - Stu · PDF fileHow to Secure Mainframe TCP/IP Stu Henderson stu@stuhenderson.com 5702 Newington Road Bethesda, MD 20816](https://reader034.vdocument.in/reader034/viewer/2022051405/5a78fd4b7f8b9a77088e41a6/html5/thumbnails/41.jpg)
For More Information
Stuart Henderson (c) 2014 www.stuhenderson.com 301-229-7187
41
Mainframe Audit News and RACF User News at www.stuhenderson.com/Newsletters-Archive.html
Website listing mainframes accessible over the Internet http://mainframesproject.tumblr.com/
![Page 42: How to Secure Mainframe TCP/IP - Stu · PDF fileHow to Secure Mainframe TCP/IP Stu Henderson stu@stuhenderson.com 5702 Newington Road Bethesda, MD 20816](https://reader034.vdocument.in/reader034/viewer/2022051405/5a78fd4b7f8b9a77088e41a6/html5/thumbnails/42.jpg)
For More Information
Stuart Henderson (c) 2014 www.stuhenderson.com 301-229-7187
42
Peter Hager’s website (BYOD and mainframe TCPIP) www.net-q.com
NewEra’s website (change control tools for configuration files) www.newera.com
Thanks for Your Kind Attention.
Questions to Stu Henderson
(301) 229-7187 [email protected]