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I understand that bmc support responded to your request, for the record here is the detail:
epddownload.bmc.com support FTP protocol listening on port 21 and support connections in active, passive, and active passive mode.
The port range for passive/extended passive connection is 64535-65535.
The epdownload.bmc.com service has load balancing characteristics and more than one IP address.
We also support two secure FTP protocols (sftp/ftps) in addition to standard ftp on filedownload.bmc.com domain. Filedownload.bmc.com can be used with the installation system(product installs and cumulative RSL) and is the host for the BMC Internet Service Retrieval (ISR) service.
ftp on fieldownload.bmc.com listening port 21 and passive/extended port range 64535-65535
ftps is listening on port 21 with same ranges. The EV certificate can be downloaded from ftp credentials page on support central.
sftp is listening on port 22. Keygen/keyscan/known host setup must be completed prior to connecting.
The installation system and BMC ISR have been updated with secure FTP options and will generate JCL to use filedownload.bmc.com when the user selects the secure FTP protocols.