You have asked a total of 14 questions on this site, of which only 6 have remained open or not been deleted. Many of your deleted questions were downvoted, ignored or otherwise off-topic

Your current question is of good quality, so may be helping you, but it is entirely possible that you have been rate limited by the automated quality ban system. We have no control of this ban system and it is imposed by the software underlying the Stack Exchange system

You should read and follow the advice on our help page Why are questions no longer being accepted from my account?

You can choose to improve the questions that you yourself have deleted, or it may be that your recently well received question may be enough to allow you to post in the near future. Be aware though that any further downvotes or deletions may lengthen your ban. This is advice only and I do not know for certain how to reinstate your ability to ask questions.

Links to your deleted questions:

http://superuser.com/questions/1015095/can-we-block-tcp-traffic-from-a-specific-user-on-a-multi-user-system-for-an-hour

http://superuser.com/questions/1002661/performing-reverse-lookup-of-ip-address-to-its-hostname

http://superuser.com/questions/999432/what-is-difference-between-disk-formating-and-flopy-disk-format

http://superuser.com/questions/990668/what-im-missing-to-solve-time-period

http://superuser.com/questions/982001/an-interaction-between-a-web-browser-and-a-web-server

http://superuser.com/questions/971957/what-is-the-efficiency-of-a-stop-and-wait-protocol

http://superuser.com/questions/968230/must-l1-be-write-through-cache

http://superuser.com/questions/966825/application-layer-pdu-size-guaranteed-to-pass-without-fragmentation-on-to-the-t

You have asked a total of 14 questions on this site, of which only 6 have remained open or not been deleted. Many of your deleted questions were downvoted, ignored or otherwise off-topic

Your current question is of good quality, so may be helping you, but it is entirely possible that you have been rate limited by the automated quality ban system. We have no control of this ban system and it is imposed by the software underlying the Stack Exchange system

You should read and follow the advice on our help page Why are questions no longer being accepted from my account?

You can choose to improve the questions that you yourself have deleted, or it may be that your recently well received question may be enough to allow you to post in the near future. Be aware though that any further downvotes or deletions may lengthen your ban. This is advice only and I do not know for certain how to reinstate your ability to ask questions.

Links to your deleted questions:

https://superuser.com/questions/1015095/can-we-block-tcp-traffic-from-a-specific-user-on-a-multi-user-system-for-an-hour

https://superuser.com/questions/1002661/performing-reverse-lookup-of-ip-address-to-its-hostname

https://superuser.com/questions/999432/what-is-difference-between-disk-formating-and-flopy-disk-format

https://superuser.com/questions/990668/what-im-missing-to-solve-time-period

https://superuser.com/questions/982001/an-interaction-between-a-web-browser-and-a-web-server

https://superuser.com/questions/971957/what-is-the-efficiency-of-a-stop-and-wait-protocol

https://superuser.com/questions/968230/must-l1-be-write-through-cache

https://superuser.com/questions/966825/application-layer-pdu-size-guaranteed-to-pass-without-fragmentation-on-to-the-t