服务状态如下：
Services Summary...
Service "PLSExtProc" has 1 instance(s).
Instance "PLSExtProc", status UNKNOWN, has 1 handler(s) for this service...
Service "orcl" has 1 instance(s).
Instance "orcl", status READY, has 1 handler(s) for this service...
Service "orclXDB" has 1 instance(s).
Instance "orcl", status READY, has 1 handler(s) for this service...
Service "orcl_XPT" has 1 instance(s).
Instance "orcl", status READY, has 1 handler(s) for this service...
The command completed successfully
使用客户端连接，服务器端已接收到连接请求syn报文
No. Time Source Destination Protocol Info
1 0.000000 117.115.5.226 117.115.5.227 TCP 59763 > ncube-lm [SYN] Seq=0 Win=8192 Len=0 MSS=1560 WS=8 SACK_PERM=1
5 3.003553 117.115.5.226 117.115.5.227 TCP 59763 > ncube-lm [SYN] Seq=0 Win=8192 Len=0 MSS=1560 WS=8 SACK_PERM=1
9 9.009560 117.115.5.226 117.115.5.227 TCP 59763 > ncube-lm [SYN] Seq=0 Win=8192 Len=0 MSS=1560 SACK_PERM=1
17 36.635806 117.115.5.226 117.115.5.227 TCP 59765 > ncube-lm [SYN] Seq=0 Win=8192 Len=0 MSS=1560 WS=8 SACK_PERM=1
18 39.636257 117.115.5.226 117.115.5.227 TCP 59765 > ncube-lm [SYN] Seq=0 Win=8192 Len=0 MSS=1560 WS=8 SACK_PERM=1
21 42.652231 117.115.5.226 117.115.5.227 TCP 59765 > ncube-lm [SYN] Seq=0 Win=8192 Len=0 MSS=1560 SACK_PERM=1
其中ncube-lm 是端口1521
为什么服务器不作响应？
...)
