Issue to connect R studio Win 10 to login remote linux server

I am trying to connect my R studio Win 10 server with remote linux server using ssh. The initial code is given below: However, I am unable to connect it. Kindly guide me.

library(ssh)
ssh_connect([liaqat:10.20.255.172:22], keyfile = NULL, passwd = 123usm, verbose = FALSE)
Error: unexpected '[' in "ssh_connect(["

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