TN5250 for Windows 7/8/8.1 + XP

Mocha TN5250 provides secure TN5250 emulation for AS/400 terminal access.
Mocha TN5250 for Windows 7    Try it free for 30 days
Price information
29.85 USD (~22 EUR)
299 USD : Unlimited Company license (*)
Lifetime free upgrades and support

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(*) With a company license it is possible to install the product on an unlimited number of work-stations.

Online user documentation.   Online user guide
Mocha TN5250 is designed for Microsoft Windows 7/8/8.1 or Windows XP with .NET Framework 4.0 (or better) installed.
  • - Operating Systems: Windows 7/8/8.1, 32/64 bit , Vista and XP with .NET framework installed.
  • - Supports all standard 5250 emulation features
  • - Alternate screen size (24x80 or 27x132)
  • - SSL/TLS (Secure Socket Layer)
  • - User defined functions keys
  • - Mouse wheel support (page up/down)
  • - Device name support
  • - Hotspots (Fx and URL text in the 5250 screen can be used as buttons)
  • - Hardcopy of screen
  • - Mail support
  • - Macro support
  • - Possible to configure the toolbar
  • - Many trim parameters
  • - Online Help
  • - Installation/Uninstallation programs
  • - Lifetime free upgrades to new versions of the product
  • - Low cost : Single User license 29.85 USD or 299 USD for a Company License.

  • For host print support , see our product Mocha tn3812 for Windows 7/8"

tn5250 for windows 7  
 Needs AS/400 Host printing, check our tn3812 printer emulator. For details and a free 30 days trial click here.


Information about the SSL option

With the Secure Sockets Layer (SSL) protocol, it is possible to establish a secure connection between the AS/400 and a Telnet client.
Limitations in Mocha TN5250 SSL:
  • - Only support for 128 bit key length.
  • - No validation of the Certificate from the AS/400.

A Certificate is used for the AS/400 to proving its identity. We have selected not to include such an option, as to keep the use of SSL as simple as possible. For most customers the main reason to select the SSL protocol, is to make the data traffic secure.

On how to enable and disable use of certificates on the AS/400 , see IBM document : step 3, #10 (yes/no)   
IBM AS/400 Information Center includes a number of publications about SSL issues.
Make a search for telnet ssl or try i400 Technical Studio (TCP Reference) and select Select Trouble shooting SSL-enabled Telnet server.

This Web page includes a summary of how to build an AS/400 system with SSL support.

We assume you will NOT use an external Certificate Authority, but generate local digital certificates for your system.
Digital Certificates are used to verify the TN5250 User is in contact with the correct AS/400. In most SSL installations, this is not a big issue. The reason for using SSL, is to create a secure encrypted session, meaning it is not possible with a net sniffer to see password or user data.
1. Install following AS/400 software programs on the AS/400 (V4R4)
  • - Digital Certificate Manager (DCM), option 34 of OS/400 (5769-SS1)
  • - TCP/IP Connectivity Utilities for AS/400 (5769-TC1)
  • - IBM HTTP Server for AS/400 (5769-DG1)
  • - One of the IBM Cryptographic Access Provider products: 5769-AC2 (56-bit), or 5769-AC3 (128-bit). Notice AS/400 Model 150 uses products 5649-AC5 and 5649-AC6
2. Configure the Digital Certificate Manager

2.1 Start the HTTP Server on the AS/400 as an ADMIN instance.

Issue following AS/400 commands:
  • - 5. Start TCP/IP servers
  • - Server application *HTTP
  • - Server instance *ADMIN

2.2 Start a Web browser as Internet Explorer 4.0/5.0/6.0 on a PC.

Select URL http://your_system_name:2001 A screen with 2 major options will be displayed. Select Digital Certificate Manager
A new screen with a menu is displayed. Select Certificate Authority (CA)
Select Create a Certificate Authority, and fill out the form. In our test case, we selected key length 512.

We must now assign the new certificate to the Telnet Server.
Go back to the main menu, and select System Certificates. Select work with secure applications
Click the button next to the application QIBM_QTV_TELNET_SERVER.
Select Work with system certificate
Select the Certificate to use.
Click Assign new certificate.
Verify a Yes is displayed next to QIBM_QTV_TELNET_SERVER. If it says No, there is something wrong.
3.0 Start Telnet Server on the AS/400.
At an AS/400 prompt write:  

4.0 Verify the Telnet Server is ready for a SSL session

At an AS/400 prompt write:  
If the Telnet server is ready, a local port with the text telnet- should be displayed. Actually the port text is telnet-ssl, but it is truncated in the default display.  

5.0 Start Mocha TN5250

If Netstat displayed the correct information's, start mocha w32 tn5250, and select menu - file - connect - advanced -
Enable the SSL option.
Press Ok , Ok, and if the SSL session works correct, the status line in mocha tn5250 will display ONLINE-SSL.   

If it does not work, check the IBM documentation for the AS/400. We can only offer very limited support on AS/400 configuration. Please use the IBM support function for such issues.