ORA-03135: connection lost contact to Standby Database

Newly built 12.1.0.2 DataGuard got errors.

Primary Database alert.log:

Mon Sep 11 11:35:59 2017
TT01: Attempting destination LOG_ARCHIVE_DEST_2 network reconnect (3135)
TT01: Destination LOG_ARCHIVE_DEST_2 network reconnect abandoned
Mon Sep 11 11:35:59 2017
Errors in file /u01/app/oracle/diag/rdbms/ractest/RACTEST1/trace/RACTEST1_tt01_30967.trc:
ORA-03135: connection lost contact
Error 3135 for archive log file 42 to 'STBTEST'
Mon Sep 11 11:35:59 2017
Errors in file /u01/app/oracle/diag/rdbms/ractest/RACTEST1/trace/RACTEST1_tt01_30967.trc:
ORA-03135: connection lost contact
LNS: Failed to archive log 42 thread 1 sequence 852 (3135)

Standby Database Alert.log

Fatal NI connect error 12170.

VERSION INFORMATION:
 TNS for Linux: Version 12.1.0.2.0 - Production
 Oracle Bequeath NT Protocol Adapter for Linux: Version 12.1.0.2.0 - Production
 TCP/IP NT Protocol Adapter for Linux: Version 12.1.0.2.0 - Production
 Time: 06-SEP-2017 16:50:33
 Tracing not turned on.
 Tns error struct:
 ns main err code: 12535

TNS-12535: TNS:operation timed out
 ns secondary err code: 12608
 nt main err code: 0
 nt secondary err code: 0
 nt OS err code: 0
 Client address: (ADDRESS=(PROTOCOL=tcp)(HOST=xx.xx.xx.xx)(PORT=63637))
Wed Sep 06 16:50:34 2017
RFS[37]: Possible network disconnect with primary database

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