Resolution happens before a connection
A player using a hostname needs an appropriate address before opening the media connection. A failure at that stage is different from successful name resolution followed by a denied HTTP request. The visible application may describe both as a connection error, so the underlying evidence matters.
DNS records can include IPv4 addresses, IPv6 addresses and aliases. Following an alias can involve further lookups. The final connection path still has to work after an address is obtained; a valid DNS answer is not a playback test.
A simple TTL example
Suppose a resolver caches an answer with a 300-second TTL. After 120 seconds, the answer can have approximately 180 seconds remaining under ordinary caching. Asking the same resolver again need not cause it to contact the authoritative server immediately. A publisher changing the address does not instantly rewrite every already cached answer.
Different caches can have observed the record at different times. Consequently, two devices or resolvers can temporarily use different valid cached information. Record the queried hostname, record type, resolver and observation time when comparing results rather than treating one lookup as a permanent global truth.
Limits of a DNS change
Changing a resolver can affect name lookup and sometimes the address selection returned for a service. It does not directly increase the Wi-Fi radio capacity, upgrade a broadband plan or repair an unsupported codec. A faster lookup and a faster media transfer are separate measurements.
Avoid replacing hostnames with arbitrary IP addresses as a casual fix. HTTPS identity checks and virtual hosting can require the intended hostname. For an intermittent issue, keep the original configuration and make controlled comparisons only where appropriate, then report whether resolution itself failed or later communication failed.
Questions about this guide
Does DNS TTL control account expiry?
No. It governs caching of DNS record information.
Does successful DNS prove the stream is reachable?
No. Connection, HTTP access, media delivery and decoding still follow.