3：查看服務器監聽服務是否啟動 [oracle@wgods ~]$ lsnrctl status LSNRCTL for Linux: Version 10.2.0.1.0 - Production on 14-DEC-2012 15:51:13 Copyright (c) 1991, 2005, Oracle. All rights reserved. Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC1))) STATUS of the LISTENER ------------------------ Alias LISTENER Version TNSLSNR for Linux: Version 10.2.0.1.0 - Production Start Date 14-DEC-2012 13:15:28 Uptime 0 days 2 hr. 35 min. 45 sec Trace Level off Security ON: Local OS Authentication SNMP OFF Listener Parameter File /database/oracle/product/dbhome/network/admin/listener.ora Listener Log File /database/oracle/product/dbhome/network/log/listener.log Listening Endpoints Summary... (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=EXTPROC1))) (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=wgods)(PORT=1521))) Services Summary... Service "PLSExtProc" has 1 instance(s). Instance "PLSExtProc", status UNKNOWN, has 1 handler(s) for this service... Service "gsp" has 2 instance(s). Instance "gsp", status UNKNOWN, has 1 handler(s) for this service... Instance "gsp", status READY, has 1 handler(s) for this service... Service "gspXDB" has 1 instance(s). Instance "gsp", status READY, has 1 handler(s) for this service... Service "gsp_XPT" has 1 instance(s). Instance "gsp", status READY, has 1 handler(s) for this service... The command completed successfully
4：使用tnsping命令檢查，報TNS-12535: TNS: 操作超時，這時我們可以肯定是防火墻的問題了 C:\Users\kerry>tnsping 172.20.32.79 TNS Ping Utility for 32-bit Windows: Version 11.2.0.1.0 - Production on 14-12月-2012 15:47:15 Copyright (c) 1997, 2010, Oracle. All rights reserved. 已使用的參數文件: E:\app\kerry\product\11.2.0\dbhome_1\network\admin\sqlnet.ora 已使用 EZCONNECT 適配器來解析別名 嘗試連接 (DESCRIPTION=(CONNECT_DATA=(SERVICE_NAME=))(ADDRESS=(PROTOCOL=TCP)(HOST=172.20.32.79)(PORT=1521))) TNS-12535: TNS: 操作超時 對于防火墻問題，我們可以有兩種解決方案： 1：關閉防火墻（這種方案不怎么好，關閉防火墻，會帶來許多安全隱患） [root@wgods ~]# service iptables stop Flushing firewall rules: [ OK ] Setting chains to policy ACCEPT: filter [ OK ] Unloading iptables modules: [ OK ]
2：修改iptables，開放1521端口，允許1521端口被連接 2.1 編輯iptables文件，添加-A RH-Firewall-1-INPUT -p tcp -m state --state NEW -m tcp --dport 1521 -j ACCEPT記錄。 [root@wgods sysconfig]# vi iptables # Generated by iptables-save v1.3.5 on Fri Dec 14 17:03:58 2012 *filter :INPUT ACCEPT [0:0] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [1749:243629] :RH-Firewall-1-INPUT - [0:0] -A INPUT -j RH-Firewall-1-INPUT -A FORWARD -j RH-Firewall-1-INPUT -A RH-Firewall-1-INPUT -i lo -j ACCEPT -A RH-Firewall-1-INPUT -p icmp -m icmp --icmp-type any -j ACCEPT -A RH-Firewall-1-INPUT -p esp -j ACCEPT -A RH-Firewall-1-INPUT -p ah -j ACCEPT -A RH-Firewall-1-INPUT -d 224.0.0.251 -p udp -m udp --dport 5353 -j ACCEPT -A RH-Firewall-1-INPUT -p udp -m udp --dport 631 -j ACCEPT -A RH-Firewall-1-INPUT -p tcp -m tcp --dport 631 -j ACCEPT -A RH-Firewall-1-INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT -A RH-Firewall-1-INPUT -p tcp -m state --state NEW -m tcp --dport 21 -j ACCEPT -A RH-Firewall-1-INPUT -p tcp -m state --state NEW -m tcp --dport 25 -j ACCEPT -A RH-Firewall-1-INPUT -p tcp -m state --state NEW -m tcp --dport 22 -j ACCEPT -A RH-Firewall-1-INPUT -p tcp -m state --state NEW -m tcp --dport 23 -j ACCEPT -A RH-Firewall-1-INPUT -p tcp -m state --state NEW -m tcp --dport 1521 -j ACCEPT -A RH-Firewall-1-INPUT -j REJECT --reject-with icmp-host-prohibited COMMIT # Completed on Fri Dec 14 17:03:58 2012 ~ ~ ~ ~ ~ "iptables" 24L, 1212C written
2.2 重啟iptables服務 [root@wgods sysconfig]# service iptables restart Flushing firewall rules: [ OK ] Setting chains to policy ACCEPT: filter [ OK ] Unloading iptables modules: [ OK ] Applying iptables firewall rules: [ OK ] Loading additional iptables modules: ip_conntrack_netbios_ns ip_conntrack_ftp [ OK ] 2.3 保存新增的規則，以免下次重啟機器后，配置規則失效 [root@wgods sysconfig]# service iptables save Saving firewall rules to /etc/sysconfig/iptables: [ OK ] 2.4 查看1521端口是否開放，允許連接（見紅色部分） [root@wgods sysconfig]# iptables -L -n Chain INPUT (policy ACCEPT) target prot opt source destination RH-Firewall-1-INPUT all -- 0.0.0.0/0 0.0.0.0/0 Chain FORWARD (policy ACCEPT) target prot opt source destination RH-Firewall-1-INPUT all -- 0.0.0.0/0 0.0.0.0/0 Chain OUTPUT (policy ACCEPT) target prot opt source destination Chain RH-Firewall-1-INPUT (2 references) target prot opt source destination ACCEPT all -- 0.0.0.0/0 0.0.0.0/0 ACCEPT icmp -- 0.0.0.0/0 0.0.0.0/0 icmp type 255 ACCEPT esp -- 0.0.0.0/0 0.0.0.0/0 ACCEPT ah -- 0.0.0.0/0 0.0.0.0/0 ACCEPT udp -- 0.0.0.0/0 224.0.0.251 udp dpt:5353 ACCEPT udp -- 0.0.0.0/0 0.0.0.0/0 udp dpt:631 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:631 ACCEPT all -- 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:21 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:25 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:22 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:23 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:1521 REJECT all -- 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited [root@wgods sysconfig]# 從客戶端用PL/SQL Developer連接數據庫，問題解決。
