Leomund's Tiny Hut (or just Tiny Hut) appears across multiple editions, with slight changes.
For reference, here's the 4e spell, as seen in Dragon 405:
You create an opaque, unmoving sphere of magical force in a close burst 4. Half the sphere is aboveground, while the other half is belowground. Creatures other than yourself can enter and exit the hut freely. If you exit the hut, the ritual is discharged.
The sphere's interior is 70 degrees Fahrenheit, and the exterior keeps out normal weather such as wind, rain, and dust. You can adjust the sphere's interior luminance from no light to dim light. The sphere is transparent from within but opaque (blocks line of sight) from the outside. Creatures inside the sphere have total concealment from creatures outside it.
The 5e version pretty clearly states "All other creatures and objects are barred from passing through it," excluding the specified targets when it's created.
The 3.5e version and the 4e version have no such language and seem to indicate that creatures besides the caster can enter and exit at will.
Having dealt with the 5e version more recently than 3.5, I was reading the 4e version and expecting a similarly powerful protection (especially since it's level 8), but it's just not there in the text.
RAW, it seems that the earlier versions of Tiny Hut are really just exceptional cover, whereas 5e's version is much more protective (to the frustration of DMs). Is there any ruling or errata to be found to clarify the effect in 4e?