リモートのmoshに繋がらなくなってしまいました．sshの認証後に失敗しています．
sshでは繋がります．
以下はmoshでssh認証以降のメッセージです．接続元で ja_JP.UTF-8 を使っているのでmoshサーバでもそれを使おうとして見つからずに失敗していそうです．
Authenticated to 192.0.2.5 (via proxy) using "publickey". bash: warning: setlocale: LC_ALL: cannot change locale (ja_JP.UTF-8) The locale requested by LC_ALL=ja_JP.UTF-8 isn't available here. Running `locale-gen ja_JP.UTF-8' may be necessary. The locale requested by LC_ALL=ja_JP.UTF-8 isn't available here. Running `locale-gen ja_JP.UTF-8' may be necessary. mosh-server needs a UTF-8 native locale to run. Unfortunately, the local environment (LC_ALL=ja_JP.UTF-8) specifies the character set "US-ASCII", The client-supplied environment (LC_ALL=ja_JP.UTF-8) specifies the character set "US-ASCII". locale: Cannot set LC_CTYPE to default locale: No such file or directory locale: Cannot set LC_MESSAGES to default locale: No such file or directory locale: Cannot set LC_ALL to default locale: No such file or directory LANG=ja_JP.UTF-8 LANGUAGE= LC_CTYPE="ja_JP.UTF-8" LC_NUMERIC="ja_JP.UTF-8" LC_TIME="ja_JP.UTF-8" LC_COLLATE="ja_JP.UTF-8" LC_MONETARY="ja_JP.UTF-8" LC_MESSAGES="ja_JP.UTF-8" LC_PAPER="ja_JP.UTF-8" LC_NAME="ja_JP.UTF-8" LC_ADDRESS="ja_JP.UTF-8" LC_TELEPHONE="ja_JP.UTF-8" LC_MEASUREMENT="ja_JP.UTF-8" LC_IDENTIFICATION="ja_JP.UTF-8" LC_ALL=ja_JP.UTF-8 Connection to 192.0.2.5 closed. Transferred: sent 3232, received 4688 bytes, in 3.3 seconds Bytes per second: sent 975.2, received 1414.6 /usr/bin/mosh: Did not find mosh server startup message. (Have you installed mosh on your server?)
試しに LC_ALL=en_US.UTF-8 を渡すと接続できました．
$ LC_ALL=en_US.UTF-8 mosh $SERVER
sshで接続して確認すると en_US.UTF-8 しか設定されていません．
$ grep -v ^# /etc/locale.gen en_US.UTF-8 UTF-8
ja_JP.UTF-8 とついでに ja_JP.EUC-JP を追加して， locale-gen コマンドでlocaleを生成しました．
$ sudo vi /etc/locale.gen $ sudo git diff /etc/locale.gen diff --git a/locale.gen b/locale.gen index afb6141..0f91c36 100644 --- a/locale.gen +++ b/locale.gen @@ -286,7 +286,7 @@ en_US.UTF-8 UTF-8 # it_IT.UTF-8 UTF-8 # it_IT@euro ISO-8859-15 # iu_CA UTF-8 -# ja_JP.EUC-JP EUC-JP -# ja_JP.UTF-8 UTF-8 +ja_JP.EUC-JP EUC-JP +ja_JP.UTF-8 UTF-8 # ka_GE GEORGIAN-PS # ka_GE.UTF-8 UTF-8 # kab_DZ UTF-8 $ sudo locale-gen Generating locales (this might take a while)... en_US.UTF-8... done ja_JP.EUC-JP... done ja_JP.UTF-8... done Generation complete.
この状態で再度 LC_ALL=ja_JP.UTF-8 の状態でmoshで接続してみるとうまく接続できるようになりました :)
以前は繋げていたのでいつの間にか /etc/locale.gen を書き換えてしまっていた?
/etc はetckeeperでgit管理しているので探してみると，locales 2.28-10 → locales 2.28-10+deb10u1 の更新時に ja_JP.UTF-8 UTF-8 がコメントアウトされていました．確認不足ですね><
環境
$ dpkg-query -W mosh locales locales 2.28-10+deb10u1 mosh 1.3.2-2.1+b1 $ lsb_release -dr Description: Debian GNU/Linux 10 (buster) Release: 10 $ arch x86_64