tns-12541 no listener nslookup dns timeout
etc/hosts
network issue right
nslookup DB-serverIP
If timeout contact to IT Admin
ipconfig /registerdns
TNS-03505: Failed to resolve name
This shows that the configuration is incorrect and the SID/service name that you are attempting to connect to cannot be resolved. Check the TNSNames entry is there for your database you are attempting to connect to. If it is, check that the IP address/DNS entry are correct as previously mentioned above when regarding configuring the TNSNames.ora file. Then, check that you can ping the IP address from the server you are making the connection from. If you can’t, that is your problem. If you are using DNS you can try using NSLOOKUP to resolve the name. For example, NSLOOKUP TEST will attempt to look up and show you the IP address for the TEST name in your DNS. The problem will be in this area somewhere. - See more at: http://www.ora00600.com/wordpress/articles/listener-tnsnames-configuration/#sthash.lsuFuJ4S.dpuf
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