导读:1建站知识在Red Hat Enterprise Linux Server Releae 5.5 成功安装ORACLE 10g 后，在客户端配置TNS后，测试是否可以连接seo网站优化网站建设制作。

在Red Hat Enterprise Linux Server Releae 5.5 成功安装ORACLE 10g 后，在网站优化seo培训客户端配置TNS后，测试是否可以连接到数据块服务器，结果报错： ORA-12170：TNS：连接超时1：首先检查网络是否能ping通，如下所示，网络是畅通的 2：检查TNS配置（TNS配置也没有问题） GSP = (DESCRIPTION = (ADDRESS =(PROTOCOL = TCP)(HOST = 172.20.36.79)(PORT = 1521)) (CONNECT_DATA= (SERVER = DEDICATED) (SERVICE_NAME = gsp) ) ) 3：查看服务器监听服务是否启动 [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命令检查，报TNS-12535: TNS: 操作超时，这时我们可以肯定是防火墙的问题了 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. 已使用的参数文件: E:\app\kerry\product\11.2.0\dbhome_1\network\admin\sqlnet.ora 已使用 EZCONNECT 适配器来解析别名 尝试连接 (DESCRIPTION=(CONNECT_DATA=(SERVICE_NAME=))(ADDRESS=(PROTOCOL=TCP)(HOST=172.20.32.79)(PORT=1521))) TNS-12535: TNS: 操作超时 对于防火墙问题，我们可以有两种解决方网seo优化趋势案： 1：关闭防火墙（这种方案不怎么好，关闭防火墙，会带来许多安全隐患） [root@wgods ~]# service iptables stop Flushing firewall rules: [ OK ] Setting chains to policy ACCEPT: filter [ OK ] Unloading iptables modules: [ OK ] 2：修改iptables，开放1521端口，允许1521端口被连接 2.1 编辑iptables文件，添加-A RH-Firewall-1-INPUT -p tcp -m state --state NEW -m tcp --dport 1521 -j ACCEPT记录。 [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网站seo优化课程-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 重启iptables服务 [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 保存新增的规则，以免下次重启机器后，配置规则失效 [root@wgods sysconfig]# service iptables save Saving firewall rules to /etc/sysconfig/iptables: [ OK ] 2.4 查看1521端口是否开放，允许连接（见红色部分） [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]# 从客户端用PL/SQL Developer连接数据库，问题解决。相关seo网站优化网站建设制作。

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