Can you show the config of the client SSL profile?
it is default.
root@(B4200-R77-S7)(cfg-sync Standalone)(Active)(/Common)(tmos) list ltm profile client-ssl clientssl
ltm profile client-ssl clientssl {
alert-timeout 10
app-service none
authenticate once
authenticate-depth 9
ca-file none
cache-size 262144
cache-timeout 3600
cert default.crt
cert-extension-includes { basic-constraints subject-alternative-name }
chain none
ciphers DEFAULT
client-cert-ca none
crl-file none
handshake-timeout 10
key default.key
mod-ssl-methods disabled
mode enabled
options { dont-insert-empty-fragments }
passphrase none
peer-cert-mode ignore
renegotiate-max-record-delay indefinite
renegotiate-period indefinite
renegotiate-size indefinite
renegotiation enabled
secure-renegotiation require
strict-resume disabled
unclean-shutdown enabled
}