# querySrv ENOTFOUND
Full text: `querySrv ENOTFOUND _mongodb._tcp.cluster0.abc123.mongodb.net`. The `mongodb+srv://` string asks DNS for SRV and TXT records to discover hosts and options. This DNS lookup failed.
## Confirm
Run `nslookup -type=SRV _mongodb._tcp.[your-cluster-host]` from the failing machine. If it fails there too, the network's DNS cannot do SRV lookups. Common in corporate DNS, some VPN configs, and minimal containers with odd resolvers.
## Fix
Two options, in order of practicality:
1. Switch to the standard connection string from the Atlas Connect dialog (`mongodb://host1,host2,host3/...`). It lists hosts explicitly and needs no SRV lookup.
2. Fix the resolver (use 8.8.8.8 or the VPC resolver) if you control the environment and want SRV long-term.
## Verify
The startup ping succeeds with the standard string from the same machine. DNS debugging can happen later, off the critical path.