'cannot rsh/rcp if change on /osp/local/home/linus/.ssh/config

i have a question need you help. on /osp/local/mhoe/liuns/.ssh/config if UseRsh = yes. i can rsh localhost vns101 linus> rsh localhost
Last login: Tue Mar 1 14:06:14 from psmf

mail: Cannot stat mailfile You have mail. [1] 18259 End of linus profile vns101 linus>

but i cannot rsh to remote host: vns101 linus> rsh 10.51.100.197

^Cvns101 linus>

if UseRsh = no. i cannot rsh localhost vns101 linus> rsh localhost vns101 linus>

but i can rsh to remote host

vns101 linus> rsh 10.51.100.197 Last login: Tue Mar 1 14:08:15 2022 [1] 98100 End of linus profile tis101 linus>

rsh


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