Troubleshooting with Firewall:

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How to check Firewall in OCI:

Sucessfully login into the server TK_Server via putty

After deleting Firewall (ingress rule) for this server:

After few second its throwing error:

Again add the Ingres rule after this it will start working

Logged in successfully:

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Troubleshooting with Routing table && Gateways:

Routing table:

Gateways:

Types

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Routing table inside OCI:

Login via Putty to this Server (TK_Server) with Routing table:

Logged in Successfully:

Login via Putty to this Server (TK_Server) without Routing table:

Unable to loggin Successfully:

Trerminate Gateways and try to login

Will add the Gateways after that routing table and then try to connect to this instance