go to: Server Manager -> System Properties Search for "xmpp.socket.ssl.client.keypass" Make sure its right and it should fix your problem if you are using the default files make sure its value is “changeit”
xmpp.socket.ssl.active true
xmpp.socket.ssl.client.keypass
xmpp.socket.ssl.client.keystore /opt/openfire/resources/security/keystore
xmpp.socket.ssl.client.trustpass
xmpp.socket.ssl.client.truststore /opt/openfire/resources/security/truststore
xmpp.socket.ssl.keypass
xmpp.socket.ssl.keystore resources/security/keystore
xmpp.socket.ssl.trustpass
xmpp.socket.ssl.truststore resources/security/truststore
有关路径：留空的话，系统会选择默认路径。可以填写相对路径(相对于安装目录)，也可以选择绝对路径https://discourse.igniterealtime.org/t/keystore-problem-cannot-convert-combined-of-type-class-java-lang-string-to-class-org-jivesoftware-openfire-spi-connectiontype/80111/1