PDB in restricted mode ,getting following error while trying to connect  :

ORA-01035: ORACLE only available to users with RESTRICTED SESSION privilege

SQL> select CON_ID,NAME,OPEN_MODE,RESTRICTED,OPEN_TIME from v$pdbs;

CON_ID NAME OPEN_MODE RESTRICTED OPEN_TIME                 <<<<<<<<<<< RESTRICTED

3      PDB1 READ WRITE YES 31.01.19 10:22:46,761000000 GMT

Pending Errors in pdb_plug_in_violations

SQL>  select name, cause, type, message, status from pdb_plug_in_violations where type = 'ERROR' and status !='RESOLVED' order

PDB1 Sync Failure ERROR "Sync PDB failed with ORA-65177 during 'alter user "xxx" ...' " PENDING     <<<<<<<<<

To solve the issue ,delete the offending statement ( alter user "xxx" ) from PDB_SYNC$ for both CDB and PDB

On CDB root ,make a backup of  PDB_SYNC$  table and delete de offending rows

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sqlplus / as sysdba

SQL> col NAME format a30

SQL> col SQLSTMT format a100

SQL> Select CTIME,SQLSTMT,NAME,FLAGS,OPCODE,REPLAY# from PDB_SYNC$;

SQL> create table BKPPDB_SYNC$ as select * from PDB_SYNC$;

SQL> delete from PDB_SYNC$ where SQLSTMT like ('%alter user "xxx"%');

SQL> commit;

On PDB make a backup of  PDB_SYNC$  table and delete de offending rows,stop / start the PDB

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SQL> alter session set container=PDB;

SQL> col NAME format a30

SQL> col SQLSTMT format a100

SQL> Select CTIME,SQLSTMT,NAME,FLAGS,OPCODE,REPLAY#  from PDB_SYNC$;

SQL> create table BKPPDB_SYNC$ as select * from PDB_SYNC$;

SQL> delete from PDB_SYNC$ where SQLSTMT like ('%alter user "xxx"%');

SQL> commit;

SQL> alter session set container=CDB$ROOT;

SQL> alter pluggable database PDB close;

SQL> alter pluggable database PDB open;