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Have you guys specified a passive port range in vsFTP?
pasv_max_port
pasv_min_port

Otherwise I'm just going to accept whitelisting the game server ip in the firewall tables, setting that php pasvip flag, and calling it a day

After a slug of bourbon and some more digging I think I found the problem. Hot NAT on NAT action, which PHP ftp doesn't necessarily play well with UNLESS you set this flag - FTP_USEPASVADDRESS - to false immediately before making the connection pasv.

I tested it ONCE and my test script worked on ...

Just swinging back to this now.

Dedicated, unmanged are fine, as stated before, as are other non-NFO servers I've tested.

But - these Managed VDS's... appears you are running vsftpd right?

When I throw an ftp_systype() at this I get: 500 OOPS: vsf_sysutil_bind - all other servers tested ...

The ftp_pasv command fails.

These are coming from a server outside your data center.

I can't see any reason for this to fail other than some firewall or other hitch on the NFO side.

Using basic PHP FTP calls: ftp_connect, ftp_login, ftp_pwd, ftp_pasv, and so on.

Code works fine on publically available FTP test servers.

Works perfectly fine on our Unmanged VDS with PureFTP ...