arcgis9.2安装问题

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<TD>在arcgis9.2安装过程中，lmt中老是出现“telnet”port(23) on node zl(主机名) does not respond    if zl is a unix system,it's probably down！请问大家是怎么回事？？各位大哥帮帮忙！</TD></TR></TABLE>