Manual DNS tests over TCP succeed but real users still fail
Operators can resolve names with one tool, yet production clients still fail because their normal UDP flow remains blocked while the manual test used TCP.
NetworkIntermediate
Manual DNS testing passes
One diagnostic command resolves names successfully, yet production clients still fail because they never take the same fallback transport path.
NetworkIntermediate
DNS over TCP succeeds but ordinary lookups still fail
One manual test passes, yet most clients still cannot resolve because UDP remains blocked while TCP fallback appears healthy.
NetworkIntermediate
A DNS resolver works for most records and large TXT lookups fail
Community-field network problem inspired by Server Fault and firewall patterns where EDNS size drift broke larger DNS responses.