왜 rsh와 함께 strace를 사용할 수 없나요?

rsh를 실행하면 작동하지만 처음에 이상한 "연결 거부" 메시지가 인쇄됩니다.

$ rsh localhost pwd
connect to address 127.0.0.1 port 544: Connection refused
Trying krb4 rsh...
connect to address 127.0.0.1 port 544: Connection refused
trying normal rsh (/usr/bin/rsh)
/home/service

그러나 strace에서 rsh를 실행하면 서버에 전혀 연결할 수 없습니다.

$ strace -c rsh localhost ulimit -n
connect to address 127.0.0.1 port 544: Connection refused
Trying krb4 rsh...
connect to address 127.0.0.1 port 544: Connection refused
trying normal rsh (/usr/bin/rsh)
rcmd: socket: Permission denied
% time     seconds  usecs/call     calls    errors syscall
------ ----------- ----------- --------- --------- ----------------
 28.39    0.000113           2        58           read
 27.64    0.000110          16         7           write
 16.83    0.000067           1        47           open
 15.33    0.000061           2        27           munmap
 11.81    0.000047           1        80           mmap
  0.00    0.000000           0        58           close
  0.00    0.000000           0         1           stat
  0.00    0.000000           0        45           fstat
   ..........................................
   ..........................................
   ..........................................

이것은 다음에서 발췌한 것입니다 strace rsh localhost ulimit -n:

connect(3, {sa_family=AF_INET, sin_port=htons(544), sin_addr=inet_addr("127.0.0.1")}, 16) = -1 ECONNREFUSED (Connection refused)
write(2, "Connection refused\n", 19)    = 19
connect(3, {sa_family=AF_INET, sin_port=htons(544), sin_addr=inet_addr("127.0.0.1")}, 16) = -1 ECONNREFUSED (Connection refused)
write(2, "Connection refused\n", 19)    = 19

질문

1. 무엇이 이것의 원인입니까 port 544: Connection refused?
2. 오류가 표시되는 이유는 무엇입니까 rcmd: socket: Permission denied? 일부 정수 값이 표시되어야 합니다( ulimit -n원격 시스템의 출력).