Oracle 12 - can't connect, what's the problem?

Question

Oracle

Installed Oracle 12 + centos7 on Friday, everything worked fine, turned off the test server for the weekend. Already as a result of further experiments, while waiting for answers - everything has changed. Current error:

Service "XE" has 1 instance(s).
Instance "XE", status UNKNOWN, has 1 handler(s) for this service...

My current listener.ora, what did I do wrong?

LLISTENER =
  (DESCRIPTION=
    (ADDRESS_LIST=
      (ADDRESS = (PROTOCOL = TCP)(HOST = lab.osk.local)(PORT = 1521))
      (ADDRESS = (PROTOCOL = ipc)(KEY=extproc) )))

SID_LIST_LISTENER =
 (SID_LIST=
  (SID_DESC=
    (SID_NAME=XE)
    (ORACLE_HOME=/u01/app/oracle/product/12.2.0/dbhome_1)
        (PROGRAM=extproc)))

When I try to connect via oracle sql developer I get:

An error was encountered performing the requested operation:
Ошибка ввода/вывода: NL Exception was generated TNS-04603: Синтаксическая ошибка: Непредвиденный символ "#" при синтаксическом разборе KEY

Answer 1

I did not solve the problem, I made it easier - I installed a docker container here https://store.docker.com/images/oracle-database-en...