cygwin에서 ssh-agent.exe 를 이용 분명 띄워 놨음에도 아래와 같은 메시지가 보여진다.
Could not open a connection to your authentication agent.

ps로 확인해보면 ssh-agent 프로세스도 보인다.
$ ps
      PID    PPID    PGID     WINPID  TTY  UID    STIME COMMAND
     5788       1    5788       5788  con 1003 09:25:52 /usr/bin/bash
     4324       1    4324       4324    ? 1003 10:52:17 /usr/bin/ssh-agent
     4168    5788    4168       5936  con 1003 10:54:03 /usr/bin/ps



처리
$ ps
      PID    PPID    PGID     WINPID  TTY  UID    STIME COMMAND
     4324       1    4324       4324  con 1003 10:56:18 /usr/bin/bash
     3788    4324    3788       2868  con 1003 10:56:39 /usr/bin/ps

$ exec ssh-agent /usr/bin/sh
$ ps
      PID    PPID    PGID     WINPID  TTY  UID    STIME COMMAND
     4324       1    4324       4384  con 1003 10:56:18 /usr/bin/sh
     5196       1    5196       5196    ? 1003 10:56:48 /usr/bin/ssh-agent
     4568    4324    4568       5464  con 1003 10:56:50 /usr/bin/ps

$ ssh-add
Enter passphrase for /win/c/DOCUME~1/user/cygwin_home//.ssh/id_rsa:********
Identity added: /win/c/DOCUME~1/user/cygwin_home//.ssh/id_rsa (/win/c/DOCUME~1/user/cygwin_home//.ssh/id_rsa)
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