Using SNA Server 4.0 SP4 and Host Integration Server in Same Network

SUMMARY

Microsoft SNA Server 4.0 and Microsoft Host Integration Server 2000 or later can operate successfully in the same subdomain. The server computer that is running the oldest version (SNA Server 4.0) must be installed as the primary server. Features that are new to Host Integration Server 2000 cannot be used until all SNA Server computers in the subdomain are running Host Integration Server 2000 or later.

Although this article discusses how to run SNA Server 4.0 and Host Integration Server within the same subdomain, when you upgrade to Host Integration Server, Microsoft recommends that you implement an SNA subdomain that contains computers that are installed with the newer version of SNA Server or Host Integration Server 2000, and then you migrate clients to these new servers. This approach requires additional servers during the transition period, although it reduces the interoperability issues that are raised when you run SNA Server and Host Integration Server computers within the same subdomain. Back-level SNA clients are supported through SNA Server 4.0 and Host Integration Server servers, although Microsoft recommends that you upgrade older clients.