If you’re having issues connecting to a server via FTPS in phpStorm I found that the magic combination for PHP Storm and FTP-SSL connections is…
In particular the Protected data channel was set to “PRTO C” by default on my install and it was that causing the bother.
[23/11/2015 12:13] Failed to transfer file 'C:\web\htdocs\ •••••\••••••••••••\test.txt': cant open output connection for file "ftps://•••.•••.•••.•••/test.txt". Reason: "500 I won't open a connection to 192.•••.•••.••• (only to 81.•••.•••.•••)".
See also: JetBrains PHP Storm: Creating a remote server configuration