Hi @swapnil_mahajan , the analysis is correct, either the GitLab runner has limited external connection and its DNS services are restricted to an internal network or the Solace PubSub+ test broker is not publicly accessible.
Can you verify if you can access the broker SEMP service (Web Manager login page) from your local computer (assuming it has no restriction to this internet address)? I expect this Solace Cloud address is public:
https://mr-connection-XXXXXXXXXXXXX.messaging.solace.cloud:943