In my situation the hotel’s DNS was properly giving out the IP address to its portal but the travel router wouldn’t respond whatsoever to DNS queries. Wireshark on a laptop showed no traffic whatsoever back; that was the firmware bug they’d addressed in the update. (DNS on the router itself going out to the hotel network was fine though.)
Nice workaround!
In my situation the hotel’s DNS was properly giving out the IP address to its portal but the travel router wouldn’t respond whatsoever to DNS queries. Wireshark on a laptop showed no traffic whatsoever back; that was the firmware bug they’d addressed in the update. (DNS on the router itself going out to the hotel network was fine though.)