|BusinessLink/WEB and Strategi Applet Requirements|
The iSeries 400 5250 communications applet is certified 100% Java by Sun Microsystems. In short, this
qualification means that the applet should function properly on any platform that is 100% Java
compliant and has a properly configured TCP/IP connection.
The following list describes the environment required for the 5250 Java applet to function properly:
Unable to make TCP/IP connection.
You are attempting access from behind a firewall that is blocking the connection or the applet cannot communicate on port 43856 due to improper workstation TCP/IP setup.
Open port 43856 to allow both inbound and outbound traffic and verify that TCP/IP is correctly configured on your workstation. In some network environments, workstations must be configured to use a Winsock proxy client. Most HTTP proxies do not provide the TCP/IP support required of the applet.
Many network administrators are concerned about opening ports above 1024 to incoming traffic, for fear of attempts at unauthorized access to their system. There is, however, a solution which severely restricts access on those ports, by limiting access to a specific IP address (in this case, the IP address of the iSeries 400). This solution is called "filtering by address". Filtering by address lets you restrict the flow of packets based on the source and/or destination addresses of the packets, without having to consider what protocols are involved. Such filtering can be used to allow certain external hosts (such as the BusinessLink Webserver) to talk to certain internal hosts (your network), and to prevent an outsider from injecting "forged" packets (packets handcrafted so they appear to come from somewhere other than their true source) into your network. (An excellent discussion of this can be found in the book "Building Internet Firewalls" by D. Brent Chapman and Elizabeth D. Zwickey, O'Reilly and Associates, Inc.)
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[ ] JVM is installed.
[ ] Browser version is IE6+, Firefox ESR, or Safari on Mac OSx.
[ ] Workstation TCP/IP is configured properly.
[ ] Workstation TCP/IP connection is stable.
[ ] Workstation has Winsock client installed if using a proxy server.
[ ] Firewall (if present) has port 43856 open for TCP traffic.
[ ] Firewall (if present) supports stream I/O.
[ ] Firewall (if present) does not terminate connections after a specified period of time.
** End of Technical Support Bulletin **