ORA-12528: TNS Listener: all appropriate instances are blocking new connections. Instance "CLRExtProc", status UNKNOWN
set ORACLE_SID=<YOUR_SID>sqlplus "/as sysdba"alter system disable restricted session;or maybe
shutdown abort;or maybe
lsnrctl stoplsnrctl start
You have to know if the problem come from the listener or from the database.
So first, restart the listener, it could solve the problem.
Second, it could come from the db if it's not in open mode (nomount, mount, restrict). To check it, connect locally and do the following query:
sqlplus /nolog
connect / as sysdba
SQL> select instance_name, status, database_status from v$instance;
I had this error message with boot2docker on windows with the docker-oracle-xe-11g image (https://registry.hub.docker.com/u/wnameless/oracle-xe-11g/).
The reason was that the virtual box disk was full (check with boot2docker.exe ssh df). Deleting old images and restarting the container solved the problem.