Error - players not downlaoding content

CMS 1.8.13, Docker, UBUNTO 16.04

For some time, the server was set to “File Download Mode” off,
I have reverted to Apache - as this is the optimal way, however since players do not download content at all.
i shave reverted back to “off”
server is set with SSL and reverse proxy, ssl is valid and no erros connecting players to the cms.
telnet to server’s Publib IP on 9505 is fine,

still. im getting many errors from players:

516 367e5e2 2020-11-30 08:33 PLAYER POST ERROR Bar-Ilan Gate 1 (Main) - New Subscriber Unable to open message: javax.crypto.IllegalBlockSizeException/null
515 367e5e2 2020-11-30 08:32 PLAYER POST ERROR Bar-Ilan Gate 1 (Main) - New Subscriber Unable to open message: javax.crypto.BadPaddingException/error:04072084:RSA routines:RSA_padding_check_PKCS1_type_2:PKCS_DECODING_ERROR

any hint is much appreciable…

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