Oracle客户端SQL Developer远程连接服务器数据库没问题，用PLSQL Developer远程连接报ORA-12170，求解

Oracle客户端SQL Developer远程连接服务器数据库没问题，用PLSQL Developer远程连接报ORA-12170，昨天用PLSQL还是可以连接上的，同一台PC，连接同一个服务器的数据库，为什么一种方式可以，另一种报错了。求解！

既然已经连接上过，那应该不是客户端的问题。你最好把sql developer连接的界面，以及plsql developer连接的界面发出来，应该是什么地方错了。

[oracle@mac02 ~]$ oerr ora 12170 12170, 00000, "TNS:Connect timeout occurred" // *Cause: The server shut down because connection establishment or // communication with a client failed to complete within the allotted time // interval. This may be a result of network or system delays; or this may // indicate that a malicious client is trying to cause a Denial of Service // attack on the server. // *Action: If the error occurred because of a slow network or system, // reconfigure one or all of the parameters SQLNET.INBOUND_CONNECT_TIMEOUT, // SQLNET.SEND_TIMEOUT, SQLNET.RECV_TIMEOUT in sqlnet.ora to larger values. // If a malicious client is suspected, use the address in sqlnet.log to // identify the source and restrict access. Note that logged addresses may // not be reliable as they can be forged (e.g. in TCP/IP). ' 连接超时， 仍是网络问题。 再看看别人怎么说的。