3 streams work, 4th doesn't

[DrO]

it's possible that for stream #1 it might be getting the html page instead of the stream (though if it's on a current DNAS build then that really shouldn't be the case, however i've not tried the link). though as jaromanda notes, using the /stream/#/ option will ensure the DNAS provides the stream to the requesting client (with the / only option a legacy handling for v1 -> v2 DNAS usage).