Why is docking permission denied?

I have noticed that under certain conditions a station will deny my docking request.
What are the various conditions that can cause a station to deny a commander's docking request?
Best Answer
I know this is an ancient question, but it still pops on the first page on Google.
While everything JonK said is absolutely correct, there is a way to "fix" the problem. If too many ships are docked at a station (usually only a problem if you have to land at one of those small stations with only 3 pads), jump in and out of supercruise. This will usually free the pads, unless they are occupied by other players.
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How do you request docking elite dangerous Xbox?
Press your UI Focus button and look to the left of your ship. Tab over to Contacts, select Training Station, and then request docking. They will confirm that you can dock at the station, and then slowly fly towards the airlock.How do you get auto docking in elite dangerous?
The Standard Docking Computer is an optional internal module that automates the ship docking process with a Station or Surface Port. After receiving permission to dock, it can be activated by decreasing the throttle to minimum with flight assist on.How do you complete landing in elite dangerous?
Select Launch. You will have to hold the buttons for the pre-flight checklist for a few seconds, and then you will be released from the hanger. Press R to thrust upwards a little bit, and then slowly exit the station through the airlock.How to fix Permission Denied Error in the Terminal and Command Prompt
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Answer 2
This has been happening quite recently. Best way I found to fix it was to go back into supercruise and log out to menu and back in. Seems to fix the issue every time in solo at least.
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