First: I have gone through all of the steps in your guide.
Second I copied the Access Keys and And access secret to Akeeba. I created a new one and copied that as well.
I checked or unchecked the mentioned boxes.
cURL is enabled on my host's server
Checked outgoing connections:
Hello John,
Outgoing connections to these two ports are allowed on all our servers. Still, I did the test and confirmed just this:
Code: topengli@serv01 [~]# host s3.amazonaws.coms3.amazonaws.com is an alias for s3.geo.amazonaws.com.
s3.geo.amazonaws.com is an alias for s3-1.amazonaws.com.
s3-1.amazonaws.com has address 207.171.163.205
topengli@serv01 [~]# telnet 207.171.163.205 443
Trying 207.171.163.205...
Connected to 207.171.163.205.
Escape character is '^]'.
^]
telnet> quit
Connection closed.
topengli@serv01 [~]# telnet 207.171.163.205 80
Trying 207.171.163.205...
Connected to 207.171.163.205.
Escape character is '^]'.
^]
telnet> quit
Connection closed.
topengli@serv01 [~]#