Recently I faced issue while pushing more files to GIT, here is solution if you face similar error message which title of this blog represent,
unable to rewind rpc post data - try increasing http.postBuffer
Error: RPC failed; curl 56 OpenSSL SSL_read: Connection was reset, errno 10054
send-pack: unexpected disconnect while reading sideband packet
Solution:
Open command prompt and copy paste below line hit on enter,
git config http.postBuffer 524288000
Above statement will increase http write buffer size, huge number of file you can able to push then.