If have problem connecting to EDM with ERS switch after upgrade of the agent code or to browser then try recreating the SSL certificate:
ssl certificate
ssl reset
show ssl
Note: Tested with Firefox 65 (64 bit) and Internet Explorer 11 against ERS 5.3.9.011 with HTTPS. Uses SHA-256 with RSA encryption. Chrome version 72 (64 bit) fails with ‘bad format’ error and may need to use an older release (ERR_SSL_SERVER_CERT_BAD_FORMAT).