Insecure Connection Error

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I can reproduce the likely reason for the error you see (see below)
You might check out this other thread for possible correction

curl -i https://www.blue-iceberg.com
curl: (35) error:0A000172:SSL routines::wrong signature type

openssl s_client -connect www.blue-iceberg.com:443
CONNECTED(00000003)
depth=2 C = US, O = Internet Security Research Group, CN = ISRG Root X1
verify return:1
depth=1 C = US, O = Let's Encrypt, CN = R3
verify return:1
depth=0 CN = blue-iceberg.com
verify return:1
40176A373E7F0000:error:0A000172:SSL routines:tls12_check_peer_sigalg:wrong signature type:../ssl/t1_lib.c:1567:
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