SSH認証ダイアログで数秒の待ちが発生する - Tera Term Ticket #25835 on SourceForge.JP

「新しい接続」ダイアログよりIPアドレスを入力し「OK」をクリックすると、「SSH認証」ダイアログが表示されますが、 数秒間の間マウスカーソル＋砂時計の状態となり、ユーザ名/パスフレーズの入力ができません。

（数秒待つと（この環境では）rhosts(SSH1)を使うがグレーアウトされ、砂時計が消え、ユーザ名/パスフレーズが入力できるようになります。）

この待ちをなくすことは可能でしょうか。

パケットキャプチャを見ると、サーバから「Server: Key Exchange Init」のパケットが 来てACKを返した後、待ち状態となり、クライアントが3秒後に「Client: Key Exchange Init」の パケットを送信しています。ですので、クライアント側の問題なのですが、この間に時間の かかる処理があるのでしょうか。

時系列にすると、以下の通りとなります(ログは秒の精度なので、多少前後するとは思います)。

  00:06:59.58 パケット： 「Client Protocol: SSH-2.0-TTSSH/2.57...」
  00:06:59    ログ：     「name: client ID」のメッセージ
  00:06:59.58 パケット： 「Server: Key Exchange Init」受信
  (00:06:59.78 パケット：「Server: Key Exchange Init」に対するACK送信)
   (空白の3秒)
  00:07:02    ログ：     「name: KEXINIT」「description: exchange algorithm list: receiving」のメッセージ
  00:07:02.38 パケット   「Client: Key Exchange Init」送信

■環境 ・Windows Vista ・TeraTerm 4.70

■ログ

TTSSH.LOG
～～～
Thu Jul 28 00:06:59 2011 [5660] ---------------------------------------------------------------------
Thu Jul 28 00:06:59 2011 [5660] Initiating SSH session
Thu Jul 28 00:06:59 2011 [5660] Received server prologue string: SSH-2.0-OpenSSH_5.1p1 Debian-5
Thu Jul 28 00:07:02 2011 [5660] SSH2_MSG_KEXINIT was sent at SSH2_send_kexinit().
Thu Jul 28 00:07:02 2011 [5660] SSH2_MSG_KEXINIT was received.
Thu Jul 28 00:07:02 2011 [5660] KEX algorithm: diffie-hellman-group-exchange-sha256
Thu Jul 28 00:07:02 2011 [5660] server host key algorithm: ssh-rsa
Thu Jul 28 00:07:02 2011 [5660] encryption algorithm client to server: aes256-ctr
Thu Jul 28 00:07:02 2011 [5660] encryption algorithm server to client: aes256-ctr
Thu Jul 28 00:07:02 2011 [5660] MAC algorithm client to server: hmac-sha1
Thu Jul 28 00:07:02 2011 [5660] MAC algorithm server to client: hmac-sha1
Thu Jul 28 00:07:02 2011 [5660] compression algorithm client to server: none
Thu Jul 28 00:07:02 2011 [5660] compression algorithm server to client: none
Thu Jul 28 00:07:02 2011 [5660] SSH2_MSG_KEX_DH_GEX_REQUEST was sent at SSH2_dh_gex_kex_init().
Thu Jul 28 00:07:02 2011 [5660] SSH2_MSG_KEX_DH_GEX_GROUP was received.
Thu Jul 28 00:07:02 2011 [5660] SSH2_MSG_KEX_DH_GEX_INIT was sent at handle_SSH2_dh_gex_group().
Thu Jul 28 00:07:02 2011 [5660] SSH2_MSG_KEX_DH_GEX_REPLY was received.
Thu Jul 28 00:07:02 2011 [5660] SSH2_MSG_NEWKEYS was sent at handle_SSH2_dh_gex_reply().
Thu Jul 28 00:07:02 2011 [5660] SSH2_MSG_NEWKEYS was received(DH key generation is completed).
～～～

ssh2connect.log(抜粋)
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<<< Tera Term SSH2 log dump >>>
saved time: 2011/07/28 00:07:02

============================================
name: pure server ID
--------------------------------------------
description: start protocol version exchange
--------------------------------------------
time: Thu Jul 28 00:06:59 2011
============================================
00000000 : 5353482D 322E302D 4F70656E 5353485F     SSH-2.0-OpenSSH_
00000010 : 352E3170 31204465 6269616E 2D350D0A     5.1p1 Debian-5..



============================================
name: server ID
--------------------------------------------
description: (null)
--------------------------------------------
time: Thu Jul 28 00:06:59 2011
============================================
00000000 : 5353482D 322E302D 4F70656E 5353485F     SSH-2.0-OpenSSH_
00000010 : 352E3170 31204465 6269616E 2D35         5.1p1 Debian-5



============================================
name: client ID
--------------------------------------------
description: (null)
--------------------------------------------
time: Thu Jul 28 00:06:59 2011
============================================
00000000 : 5353482D 322E302D 54545353 482F322E     SSH-2.0-TTSSH/2.
00000010 : 35372057 696E3332                      57 Win32



============================================
name: KEXINIT
--------------------------------------------
description: exchange algorithm list: receiving
--------------------------------------------
time: Thu Jul 28 00:07:02 2011
============================================
00000000 : 6D93756C 9805D5BF BEF0E76F BAA498E5     m.ul.......o....
00000010 : 0000007E 64696666 69652D68 656C6C6D     ...~diffie-hellm
00000020 : 616E2D67 726F7570 2D657863 68616E67     an-group-exchang
00000030 : 652D7368 61323536 2C646966 6669652D     e-sha256,diffie-
00000040 : 68656C6C 6D616E2D 67726F75 702D6578     hellman-group-ex
00000050 : 6368616E 67652D73 6861312C 64696666     change-sha1,diff
00000060 : 69652D68 656C6C6D 616E2D67 726F7570     ie-hellman-group
00000070 : 31342D73 6861312C 64696666 69652D68     14-sha1,diffie-h
00000080 : 656C6C6D 616E2D67 726F7570 312D7368     ellman-group1-sh
00000090 : 61310000 000F7373 682D7273 612C7373     a1....ssh-rsa,ss
(略)
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■パケット

http://twitpic.com/5wpkrq/full