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Getting “can only post questions every 20 minutes” but did not post recently

I only have 107 reputation on Stack Overflow. Often when I try posting a question I get this error, even though it's my first question of the day (meaning I haven't posted a question for over 12 hours):

Oops! Your question couldn't be submitted because:

users with less than 125 reputation can only post questions every 20 minutes; try again later.

Why is this happening? Is it possible that a failed captcha check could cause it?

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marked as duplicate by Al E., Pops, Shog9 Nov 10 '11 at 2:41

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

up vote 9 down vote accepted

There's another user who shares your IP address, also has a very low reputation on the site, and asked a question just a few minutes before you tried to post yours.

So, you got blocked.

Once 20 minutes passed from the time this other user posted, you were able to post.

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In my company all the users are using a same proxy thats why i got blocked. So there is no way except i got 125 reputation – Kamal Deep Singh Nov 9 '11 at 6:12
Yup. Or, I suppose, coordinate with your co-workers. But really, you're almost there already. – Shog9 Nov 9 '11 at 6:15
yes, but the developers of stckoverflow can taken into account that there are large number of persons especially in the colleges who are provided a single proxy address. In this case if a college has almost 2000 users in that case its like a race condition whose question will get posted. This should be taken into account. We expect this form stackoverflow. – Kamal Deep Singh Nov 9 '11 at 6:22
The rate-limiting is in effect to prevent a very serious problem - don't expect to see it changed any time soon. If you're asking a large number of questions, you should go out of your way to ensure they are high-quality and get up-voted - this is a good idea anyway, but in this case also helps you get past the "new user restrictions" faster. – Shog9 Nov 9 '11 at 6:28

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