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Had same issue on console server to 9300 swtich, enable Xon/Xoff fixed it. It worked on other cisco devices without the Xon/Xoff but not on 9300 switch.
Forward Secrecy -Resolved with adding dhe-aes256-sha1:dhe-aes128-sha to TLSV1.2 & finding DHE-RSA-AES128-SHA that would work with ASDM and V1.2 and didn’t break the forward secrecy. This worked on 5515-X and 5516-X.
router# show run all ssl
ssl...
