SCP RSYNC Not Work

1. SSH 連線正常，但 scp rsync 卻卡住，顯示除錯過程，卡在 exec request accepted on channel 0：
   

   [root@dns ~]# scp -vvvvv aaa 163.17.27.219:
   .....
   debug2: channel_input_status_confirm: type 99 id 0
   debug2: exec request accepted on channel 0
   debug3: Wrote 64 bytes for a total of 1573
   

2. rsync 出現以下錯誤訊息。
   

   [root@dywang ~]# rsync -v aaa 163.17.27.219:
   reverse mapping checking getaddrinfo for e.csie.personal.static.219
   .ippool.cyut.edu.tw [163.17.27.219] failed - POSSIBLE BREAK-IN ATTEMPT!
   protocol version mismatch -- is your shell clean?
   (see the rsync man page for an explanation)
   rsync error: protocol incompatibility (code 2) at compat.c(171) [sender=3.0.6]
   

3. SSH 要連線的遠端修改以下設定後，重新啟動 sshd 服務。
   

   [root@dyw219 ~]# vim /etc/ssh/sshd_config 
   [root@dyw219 ~]# egrep '^(UseDNS|GSSAPIAu)' /etc/ssh/sshd_config 
   GSSAPIAuthentication no
   UseDNS no
   [root@dyw219 ~]# /etc/init.d/sshd restart
   

4. 再執行 rsync 連線，錯誤訊息減少如下：
   

   [root@dywang ~]# rsync -v aaa 163.17.27.219:
   protocol version mismatch -- is your shell clean?
   (see the rsync man page for an explanation)
   rsync error: protocol incompatibility (code 2) at compat.c(171) [sender=3.0.6]
   

5. 出現以上錯誤訊息，主要是連線時取得 shell 時的設定或腳本有問題，經檢查是 /etc/bashrc 環境變數 TERM 造成，移除後正常。
   

   [root@dyw219 ~]# diff -uN /etc/bashrc scptmp/bashrc 
   --- /etc/bashrc	2013-10-02 17:06:18.000000000 +0800
   +++ scptmp/bashrc	2017-06-26 07:44:11.000000000 +0800
   @@ -84,3 +84,4 @@
        unset pathmunge
    fi
    # vim:ts=4:sw=4
   +env TERM=linux setterm -regtabs 4