Paradigm Touchscreen Remote iPadOS version 1.0.1.58; iPad OS version 17.1.1 on 3rd generation iPad Pro

When you say "configured the iOS app" do you mean that's the IP you assigned to the iPad in the iOS setting, or that is the IP you set up in the Paradigm Touchscreen Remote app? If in the PTS Remote app, change it to be 10.101.15.101. It needs to know the IP of the touchscreen you want to connect to. The iPad must have its own unique IP within the same subnet (likely 255.255.0.0 since it's the default ETC scheme) not used by other devices.

The Paradigm Touchscreen Remote IP is 10.101.15.101.  The connection to the network uses subnet 255.255.0.0  App worked for about 18 months and suddenly started displaying error.

Did this coincide with the iOS 17 upgrade, or was it occurring before that?

No idea when it failed relative to iPadOS updates.  I found an old iPod with 12.5.7 on it.  I could connect to Paradigm using Safari web interface but the Touchscreen Remote had the same error

I tried connecting on my iPhone 13 Pro iOS ver 17.1.1 and it worked!  Still not working in iPad.

What are the differences in IP settings for the iPhone vs iPad? Does one have a DNS server IP defined and another doesn't?

DNS is set to Automatic on both iPhone and iPad.  Having trouble inserting PDF showing IP, and app on both devices.  Here's dropbox link www.dropbox.com/.../iPhone-iPad.pdf

Thank you for providing that. I'd like to try a couple things:

• Can you change the DNS IP from Automatic to something valid, such as 8.8.8.8 (Google) or 1.1.1.1 (Cloudfare) and then see if it works? There is no expectation that the iPad/iPhone will connect to a DNS server while connected to a WAP on the closed ETC network, but we've noticed some iDevices and Windows 11 are starting to require a DNS IP defined in order for it to be a valid network connection.
• If adding the DNS doesn't help, can you power cycle the P-TS7 touchscreen and see if it works with the iPad?

iPad now on 17.1.2

Tried both 8.8.8.8 and 1.1.1.1 for manual DNS. Power cycled both iPad and P-TS7.  Still getting same error on iPad.  

Apologies for the delay in response. I suspect there may be a previously unidentified bug, that we're working to reproduce and characterize. I've heard from some other folks running into similar difficulties on iPhone or iPad. When we learn more I can provide a further update.

Thanks for update.

Another bit of info - Paradigm version info

Thanks for update.

Another bit of info - Paradigm version info