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HTTP File Upload is not working

Hello, I’m trying to upload / download files via Openfire, but I’m facing a critical problem.
I installed HTTP File Upload Plugin and tried to file transfer,
Small size files worked fine but huge (about over 50kib) files haven’t worked.

And when I check Android Client(Conversation) logcat, It says java.io.IOException: unexpected end of stream on https://domain.com:7443

iOS Client(Siskin.IM) also like that (Connection lost, -1005 error)
Please give me a solution if you know!
Thank you