In order to verify, I also telnet 1035/1026 can pass.īut why, is it because of this IP reason, how can this "127.0.0.1" changed to "0.0.0.0".ġ521 is the Oracle listening port, and the problem is estimated to be on the monitor itself. I tried to telnet 1080 port, found that it can, the only difference is that one end is "0.0.0.0", One is "127.0.0.1". The 1521 port is in the listening state, but the server port cannot be telnet from my native computer. Use commands to view current port conditions Netstat-a–nĬ:\Documents and Settings\administrator>netstat-a-n Telnet to the Oracle server's 1521 port again, still fails to connect. However, it is found that connecting Oracle directly on the Oracle server does not connect properly.Īfter the discovery for Listener.ora caused, after the modified \product\10.2.0\db_1\network\admin\listener.ora database returned to normal. Oracle server and this machine are in the LAN, there is no network problem, how can not connect.Ĭheck that the 10.201.70.68 does not start the firewall, you can ping. Unable to open connection to host on port 1521: Connection failed I tried telnet to the Oracle server 1521 port, prompting the connection to fail.ĭ:\Documents and Settings\administrator>telnet 10.201.70.68 1521Ĭonnecting to 10.201.70.68. The project started today and suddenly prompted that remote Oracle could not be connected. \terminal Server\winstations\rdp-tcp Branch, also changes the "PortNumber" key value below it.Ģ, Unable to open connection to host, on port 1521: Connection Failed resolution Once the above settings are complete, you need to expand the HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control On this, open Registry Editor, expand Hkey_local_machine\system\Ĭurrentcontrolset\control\terminal server\wds\rdpwd\tds\tcp "Branch, the" PortNumber "key value corresponding to the port number, it can be modified. The default port for Remote Desktop Terminal Services is "3389", and you need to make changes to the default port to prevent others from making malicious connections. 1, modify the Remote Desktop Connection port
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