Unable to connect RStudio to database

Hi all,
I tried to connect my R Studio to Netezza database to directly run sql queries and it always gives me the following error:

Error: nanodbc/nanodbc.cpp:950: 08001: Client unable to establish connection

I have tried using the below mentioned code, connections tab and other methods. Any help would be highly appreciated.

con <- DBI::dbConnect(odbc::odbc(),
Driver = "NetezzaSQL",
Server = "server name",
Database = "database name",
UID = "username",
PWD = "password",
Port = portnumber)


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