Siebel - The SCBroker listening port may already be in use by another process

SBL-SCB-00016: Inherited socket (0) is invalid. The SCBroker listening port may already be in use by another process

STEPS
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The issue can be reproduced at will with the following steps:
1. Login to siebel server box.
2. Run siebenv.sh
3. Run start_server all
4. Server is not coming up and throwing error.

BUSINESS IMPACT
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The issue has the following business impact:
Customer has schedule a downtime to restart the siebel servers.As the siebel server is not come up all the Siebel Marketing users will affect,it will impact their production.

CAUSE
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Issue is caused due to SCBroker component port is used by some other process in the System.

SOLUTION
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1)Open a command prompt in siebel server.
2)Run netstat -a
3)verify and kill if any process using  port 2321 or reboot the OS to release the 2321 port.
4)Bring up the Siebel server and verify the status.