After R12.1.3 installation adstrtal.sh is exiting with error code 3

Issue -> 
After R12.1.3 installation adstrtal.sh is exiting with error code 3

Although the startup script is giving error, all the modules and technical components are working fine, as there is no user complain till now. So, all the
components are starting perfectly. Only startup script is showing error though the components are starting perfectly.

The above error is same as ADSTRTAL.sh returns error : TIMED OUT( 100000 ): INTERRUPTED EXCEPTION (Doc ID 564536.1)

But, by applying the above mentioned document solution has not solved our problem.

Solution ->

We have solved our problem by reviewing section "Some or all the startup scripts report a timeout error" of "Starting up AS10g services in an EBusiness Suite Release 12 environment (Doc ID 743518.1)".

The problem was due to the entry we put during Oracle apps installation in /etc/resolv.conf file as per installation document.

The entry in /etc/resolv.conf  was 
------- 
nameserver 172.xx.xx.xx 
options attempts:5 
options timeout:15 
---------- 

I have modified it to the following. 
--------- 
nameserver 172.xx.xx.xx