windows - Issue on IIS about Downloading Files from iOS -


i have ios app downloads files server. upgraded server windows server 2012 windows server 2016. after upgrading ios app started have trouble downloading files new server.

while upgrading server changed ssl certificate , started using wilcard ssl certificate. why thought ssl issue reason. when try on old server saw app download files old server no issue.

then thought server having packet loss. when tested after 9000 packets saw 1 packet loss; wasn't case too.

then thought maybe failed in iis causes connection loss. when tested (iis failed request logs) saw nothing problematic.

when debug ios app seeing following logs. couldn't find proper answer issue.

any ideas look?

previous os & iss version: windows server 2012 (build 9200) / iis 8 (8.0.9200.16384)

previous os & iss version: windows server 2016 (1607 - build 1493.1593) / iis 10 (10.0.14393.0)

ios app networking library: afnetworking

ios error logs:

[] nw_socket_set_receive_low_water_mark setsockopt so_rcvlowat 3537 fd 28 failed: [22] invalid argument

[] nw_endpoint_handler_add_write_request [49.1 myip:443 failed socket-flow (satisfied)] cannot accept write requests

[] tcp_connection_write_eof_block_invoke write close callback received error: [22] invalid argument

it http/2 default on iis 10. there no option turn off used following registry keys turn off on server. files downloading no issue ios.

of course have address issue on ios , let download files on http/2 working.

hkey_local_machine\system\currentcontrolset\services\http\parameters  enablehttp2tls reg_dword 0  enablehttp2cleartext reg_dword 0

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