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You're welcome. Yes, the for loop does not redirect stdin, whereas the while read loop does. stdin is needed by the ssh command, so ssh was complaining that stdin could not be used..
The adaptation...

Try:
while read HOST <&3; do ssh $HOST; done 3<dbs_group

Try awk ' {LN[$1]; HD[$2]; MX[$1,$2]=$3}
END { printf "%10s", ""; for (i in HD) printf "%10s", i; print "";
for (j in LN) {printf "%10s",j; ...