Put the summary of the bug you're having here
What I expected to happen was...:
I should appear in the nether and have fun
What actually happened was...:
I didn't appear in the nether but the void which was not fun
Steps to Reproduce:
1. Build a 5x5 nether portal (5x5 obisidian and 3x3 portal blocks)
2. Walk into the nether portal
3. Wait and you shall die
MCprohosting is not supported by mojang, unless you can reproduce with nothing but the vanilla server.jar (no online service) this is invalid.