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Is the agent behind a load balancer? If that's the case, Ask the IT to configure a sticky session in the load balancer of the agent and try again.
Step 6 - Use Mygrower.culturatech.com as a proxy on agent server
Step 7 - Agent assembly 9200
Step 8 - Gateway side, put a small value in the long polling timeout ex: 59 in order to test connectivity to agent and gateway. Config file of gateway service.. only useful when alot of agents are having issues.. would not try if only 1 or 2 agents are not working.
Step 9 - check if new server has been installed or network configuration has changed like DNS or authentication changes or even patches have changed on client server.