Had the same problem and managed to find out what was causing it. In my case I messed up when initializing the search heads and gave them the wrong value of the conf_deploy_fetch_url. if that value does not match with the url of the deployer it will not accept the bundle you are trying to push out.
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I downvoted this post because vise versa is true as well. many times users may not know the documentation page link.
on my answer, i have clearly replied the correct process and then for more clarity i have given the docs link. i don't see anything wrong with my answer.
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i fixed it by changing the max_content_length in server.conf.
As stated, the file exceeds max_content_length in server.conf of 800 MB. This can be increased by adding the following to $SPLUNK_HOME/etc/system/local/server.conf.
[httpServer]
max_content_length = 1600000000
my bundle had a huge lookups and that was causing this error.
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