BUG #15077: Unable to receive data from WAL Stream Error

The following bug has been logged on the website:

Bug reference:      15077
Logged by:          Kolla Mahesh
Email address:      kollamahesh67@gmail.com
PostgreSQL version: 9.6.3
Operating system:   RHEL
Description:

We are getting a lot of errors saying 

< 2018-02-20 06:13:54.205 CST >FATAL:  could not receive data from WAL
stream: could not receive data from server: Connection timed out

< 2018-02-20 06:13:54.217 CST >LOG:  record with zero length at 4/B8098430
< 2018-02-20 06:13:56.867 CST >LOG:  started streaming WAL from primary at
4/B8000000 on timeline 4


< 2018-02-19 01:37:48.847 CST > FATAL:  could not receive data from WAL
stream: SSL SYSCALL error: Connection timed out

sh: dev/null: No such file or directory
sh: dev/null: No such file or directory
< 2018-02-19 01:37:48.860 CST > LOG:  invalid resource manager ID 48 at
15/2D69E848
< 2018-02-19 01:37:48.916 CST > LOG:  started streaming WAL from primary at
15/2D000000 on timeline 1