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Sophos Switch - Server did not respond to client hello

Hi 

We have a switch which was connected to Sophos Central, however it now shows up as disconnected

When we look in the firewall SSL/TLS inspection logs we are seeing this regularly from the switch 

cswitch-proxy.cloudstation.us-west-2.prod.hydra.sophos.com
Server did not respond to client hello

2023-08-23 17:54:50SSL/TLS inspectionmessageid="19017" log_type="Content Filtering" log_component="SSL" log_subtype="Error" severity="Information" user="" src_ip="172.16.16.10" dst_ip="54.187.224.189" user_group="" src_country="R1" dst_country="USA" src_port="55679" dst_port="443" app_name="" category="Software Updates" con_id="3608504512" rule_id="0" profile_id="1" rule_name="System exclusions" profile_name="Maximum compatibility" bitmask="" key_type="KEY_TYPE__UNKNOWN" key_param="Unknown" fingerprint="" resumed="0" cert_chain_served="TRUE" cipher_suite="" sni="cswitch-proxy.cloudstation.us-west-2.prod.hydra.sophos.com" tls_version="Unknown" reason="Server did not respond to client hello" exception="" message=""