The gateway id issue is all over the forum. Please take time to learn to use it’s facilities such as the search ( ) top right and the edit of your own posts ( click … and then )
As mentioned just a few posts earlier as a bonus hint…. Sadly some just do not pause to read and digest before ploughing on! As you say Nick - Forumites please read the docs, use search and edit if needed….just not too long after the fact such that context of following answers disappears or gets orphaned
As already explained - delete the old registration and try again with a new GW ID - the system will autopopulate with one based on the eui as you can see - delete this and overtype with your new free form text AS ADVISED…
As Jac mentioned earlier some of your previous pictures have content obscured by menues etc. The docs for this item seem to use old TTN V2 console for setting up, which doesn’t help as should really be updated for V3 (Shame on you Rising HF! ), however I notice that whilst you have packet forwarder protocol enabled your pictures dont show which version/how set up. On early systems I believe they supported both the legacy Semtech Packet forwarder and what was labled the TTN Packet Forwarder - an alternate implementation, with a different back end connection mechanism, that is now deprecated! Have you fallen into the trap of doing what might seem logical and selecting TTN Packet Forwarder in the set up? If so please show us the options you are presented with and change and selection to Semtech Packet Forwarder - this is the classic system that makes use of UDP targeting Port 1700 and should work seamlessly with the guidance you have been given.
I have tried to register my gateway again by deleting the ID 503139532b7c4750 from the list. It keeps on telling me that it already exists. How can I fix this?
First question that comes to mind is why you felt the need to delete it and register again. There should not be any need.
To help resolve your issue we need to know the exact error message you get. If it mentions the ID being taken (90% of the cases and a question that appears on the forum at least once every week) you need to add it again with the same EUI but a different ID (that is a field you can modify from the proposed default value).