Currently, my nodejs application access is still corrupted as above (There are times when the access does not appear error). I am trying to find the cause. Can you give me a log of my nodejs application. I tried blocking all outbound connections on my local environment and I got the following error I tried blocking port 27017 on my local environment and I got the following error My MongoDB is stored as "Replica Set - 3 nodes" so when the primary node (104.40.21.132:27017) fails to connect, it will redirect to the other two nodes but the firewall will block it. So can you please add secondary node ip 104.40.21.243 and 138.91.174.29 to the whitelist in Tommy's firewall. Thanks very much