Looking for logging into the Can't To Oracle Sqlplus site and are not getting the correct working link for it? In such a case, you can use the links given here by searching your desired login page in the search box. If the page is present on our website then you will get all the links related to the Can't To Oracle Sqlplus site. After that you can login as usual with your login credentials.
https://community.oracle.com/thread/1007722?start=15&tstart=0
https://asktom.oracle.com/pls/apex/f?p=100:11:::NO::P11_QUESTION_ID:9537348100346994790
https://stackoverflow.com/questions/41083540/i-cant-login-to-oracle-system-account
https://it.toolbox.com/question/not-able-to-login-to-oracle-database-from-sql-plus-073110
https://dba.stackexchange.com/questions/150879/not-able-to-login-to-oracle-using-sqlplus-utility-because-username-and-password
https://dba.stackexchange.com/questions/140032/how-to-connect-to-oracle-12c-from-sqlplus-without-password-in-command-line
https://dba.stackexchange.com/questions/55077/why-cant-i-log-in-to-system-without-as-sysdba
https://superuser.com/questions/1307306/why-cant-i-connect-to-sqlplus-when-specifying-the-oracle-sid-and-password-from
https://serverfault.com/questions/163006/sqlplus-connect-command-with-an-symbol-in-the-password
https://ss64.com/ora/connect.html
https://kb.iu.edu/d/anja
http://tech.e2sn.com/oracle/troubleshooting/hang/how-to-log-on-even-when-sysdba-can-t-do-so
https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/USER_ConnectToOracleInstance.html