s3 Max retries exceeded Failed to establish a new connection: [Errno 16] Device or resource busy

Question

Hello, 
We are using s3 service to upload file in s3 bucket in php. when we tried to upload a file it gives below error.
HTTPSConnectionPool(host='
bucket-name.s3.ap-south-1.amazonaws.com
', port=443): Max retries exceeded with url: /file-path.pdf (Caused by NewConnectionError(': Failed to establish a new connection: [Errno 16] Device or resource busy'))

please help me why we are facing this issue all of sudden.? what does this mean..? how can i resolved this..?
I tried uploading the file using aws cli with same access key and secret key which is mention in the code and i am able to upload successfully. then why i am getting error when using this in code.

Answer

Based on your description, it is not clear where you PHP app is running.  EC2, on-premises, etc?

Was your CLI test from the same server? or from a workstation?
Your test seem to take out permissions (IAM/bucket policy) as a cause.

My first thought is that this is network related from the PHP app server to S3.  I would examine this and look for changes.

Hope this helps.

s3 Max retries exceeded Failed to establish a new connection: [Errno 16] Device or resource busy

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