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If you are the system administrator of this resource then you should check the error log for details.
Faithfully yours, nginx.
Just hoping that might help do away with some of the multiple posts around here.
The error log URL (HTML imbedded link) http://nginx.org/r/error_log
When you get that message, your reply probably did go through.
It’s a good practice to checks your pings or refresh the thread to see if it did post before attempting to post it again.