Go into settings (the gears/cogs icon in the top right of the main menu), then scroll down to "nether" and select it, that bring up the nether options which include the upper and lower Y limit for the nether
If it said "Mysterious forces prevented you from opening that portal. Please try another location", then there isn't a suitable portal destination for that location and you should try opening a portal at another location.
Reasons for there being no suitable destination location are usually quite extreme, for example the entire area around the destination might be protected/owned by someone else down to a deep depth, or be full of structures that people have built. But those two scenarios seem unlikely unless you're already in the nether and trying to open a portal to the surface where there's a big city or something.
If it actually said "Nether portal fails to open", then this probably isn't the same nether mod as the one you have installed, because there isn't any text like that inside this mod.
If you put the details into the issue tracker it can probably be solved. Include where you were when you tried to activate the portal and which game you are playing, what other mods are loaded (a mod might be why the area is blocked), and the wording of the "portal fails to open" message.
For metal ores on singlenode, you can set the island altitude to be a suitable height for finding ores, e.g. the floatlands altitude of 1024+ provides both plantlife biomes and metal ores.
Settings → All Settings → Content: Mods → cloudlands → Altitude of islands
Alternately for finer control, edit the y_min and y_max values of the register_ore() statements in minetest_game's mods/default/mapgen.lua (if you're using it with MTG)
Thanks for the stack trace, this is fixed by v1.55
(fwiw bugs are often better raised using the Issue Tracker link, I only happened to see this comment notification because I logged into the ContentDB website for some Amidst work)
I've just tested this with the fireflies built into MinetestGame, and again with MinetestGame running Shara's firefly mod, and in both cases I saw the fireflies appear.
It might be something other than the nether that's causing the problem, but if not, there's an issue tracker for the nether where you could raise it - mention which game you are using and which fireflies mod so I have a better chance of being able to make it happen.
(or you can continue here if you like, just that nether mod devs might not see it)
It's a problem on Ethereal. Ethereal limits both its biomes and the trees that grow in them by altitude, there's a discussion of barren Ethereal Cloudlands here
Go into settings (the gears/cogs icon in the top right of the main menu), then scroll down to "nether" and select it, that bring up the nether options which include the upper and lower Y limit for the nether
If it said "Mysterious forces prevented you from opening that portal. Please try another location", then there isn't a suitable portal destination for that location and you should try opening a portal at another location.
Reasons for there being no suitable destination location are usually quite extreme, for example the entire area around the destination might be protected/owned by someone else down to a deep depth, or be full of structures that people have built. But those two scenarios seem unlikely unless you're already in the nether and trying to open a portal to the surface where there's a big city or something.
If it actually said "Nether portal fails to open", then this probably isn't the same nether mod as the one you have installed, because there isn't any text like that inside this mod.
If you put the details into the issue tracker it can probably be solved. Include where you were when you tried to activate the portal and which game you are playing, what other mods are loaded (a mod might be why the area is blocked), and the wording of the "portal fails to open" message.
For metal ores on singlenode, you can set the island altitude to be a suitable height for finding ores, e.g. the floatlands altitude of 1024+ provides both plantlife biomes and metal ores.
Settings → All Settings → Content: Mods → cloudlands → Altitude of islands
Alternately for finer control, edit the y_min and y_max values of the
register_ore()statements in minetest_game'smods/default/mapgen.lua(if you're using it with MTG)Thanks for the stack trace, this is fixed by v1.55
(fwiw bugs are often better raised using the Issue Tracker link, I only happened to see this comment notification because I logged into the ContentDB website for some Amidst work)
I've just tested this with the fireflies built into MinetestGame, and again with MinetestGame running Shara's firefly mod, and in both cases I saw the fireflies appear.
It might be something other than the nether that's causing the problem, but if not, there's an issue tracker for the nether where you could raise it - mention which game you are using and which fireflies mod so I have a better chance of being able to make it happen.
(or you can continue here if you like, just that nether mod devs might not see it)
It's a problem on Ethereal. Ethereal limits both its biomes and the trees that grow in them by altitude, there's a discussion of barren Ethereal Cloudlands here
More important than a bullwhip & hat
Does what it says on the tin, adding map location bookmarks with the ability to easily teleport back again.
Also handy to return to exact position a screenshot was taken from, for before/after comparisons, or trying to tune the perfect shot.