Scheduler Usage

When we try to transfer multiple files with the CTLM AFTP module we are getting following error and on rerun job is completing successfully.
we are trying to understand possible cause for this issue.

Transfer #1 transferring

Transferred: 0 Elapsed: 0sec Percent: 0 status: In Progress
Transferred: 2764800 Elapsed: 1sec Percent: 1 status: In Progress
Transferred: 5529600 Elapsed: 3sec Percent: 2 status: In Progress
Transferred: 8290304 Elapsed: 5sec Percent: 3 status: In Progress
Transferred: 11055104 Elapsed: 7sec Percent: 4 status: In Progress
Transferred: 13819904 Elapsed: 9sec Percent: 5 status: In Progress
Transferred: 16580608 Elapsed: 11sec Percent: 6 status: In Progress
Transferred: 19345408 Elapsed: 13sec Percent: 7 status: In Progress
Transferred: 22110208 Elapsed: 16sec Percent: 8 status: In Progress
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Transferred: 135401472 Elapsed: 109sec Percent: 49 status: In Progress
Transferred: 138166272 Elapsed: 110sec Percent: 50 status: In Progress
Transferred: 140931072 Elapsed: 112sec Percent: 51 status: In Progress
Transferred: 143691776 Elapsed: 115sec Percent: 52 status: In Progress
Transferred: 146456576 Elapsed: 117sec Percent: 53 status: In Progress
Transferred: 149221376 Elapsed: 119sec Percent: 54 status: In Progress
Transferred: 151982080 Elapsed: 121sec Percent: 55 status: In Progress
Transferred: 154746880 Elapsed: 124sec Percent: 56 status: In Progress

FTP_transfer_packet: sftp_put_chunk() failed nBytes = '-1'.
Error: error while writing: permission denied

FTP_do_transfer: Error write to destination . res = [0] nBytesToWrite = [4096]
Transfer #1 completed with errors !!!

Job executed with errors !!!. exiting.

There can possibly be no of reasons.I look at following if that helps you to start with.

If is an intermittent issue, (i.e incase where a re-run at later time works fine)

NW glitches.
Remote host issues.
Local host agent on which AFT module is over loaded at that time(yes,I did see issues when agent is using hiugh memory).
Remote host IP(not host name) changing dynamically w.r.t their high availability configuration and you have a specific IP firewall configuration.

If standard issue,
I would make sure AFT module is in latest FixPack for that version.
Also check if any inteoperatability issues by contacting BMC supprot and FTP applicaiton vendors.

Sorry for not being specific but hope it helps to look at areas of interest.

Thanks

Thanks for response.
It could be because of below NW glitches and working with my network team.
I will post the details, once I have the update.

Anyone out there have a straight answer for this error?
I'm getting the exact same error.