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完整报错如下：
Jicofo 2020-08-07 09:19:09.896 SEVERE: [16] org.jitsi.impl.protocol.xmpp.XmppProtocolProvider.log() Failed to connect/login: javax.net.ssl.SSLHandshakeException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
org.jivesoftware.smack.SmackException: javax.net.ssl.SSLHandshakeException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
at org.jivesoftware.smack.tcp.XMPPTCPConnection$PacketReader.parsePackets(XMPPTCPConnection.java:1076) at org.jivesoftware.smack.tcp.XMPPTCPConnection$PacketReader.parsePackets(XMPPTCPConnection.java:1076)atorg.jivesoftware.smack.tcp.XMPPTCPConnectionPacketReader.access$300(XMPPTCPConnection.java:1000) at org.jivesoftware.smack.tcp.XMPPTCPConnection$300(XMPPTCPConnection.java:1000)atorg.jivesoftware.smack.tcp.XMPPTCPConnectionPacketReader$1.run(XMPPTCPConnection.java:1016) at java.lang.Thread.run(Thread.java:748) Caused by: javax.net.ssl.SSLHandshakeException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target at sun.security.ssl.Alert.createSSLException(Alert.java:131) at sun.security.ssl.TransportContext.fatal(TransportContext.java:327) at sun.security.ssl.TransportContext.fatal(TransportContext.java:270) at sun.security.ssl.TransportContext.fatal(TransportContext.java:265) at sun.security.ssl.CertificateMessage$1.run(XMPPTCPConnection.java:1016)atjava.lang.Thread.run(Thread.java:748)Causedby:javax.net.ssl.SSLHandshakeException:PKIXpathbuildingfailed:sun.security.provider.certpath.SunCertPathBuilderException:unabletofindvalidcertificationpathtorequestedtargetatsun.security.ssl.Alert.createSSLException(Alert.java:131)atsun.security.ssl.TransportContext.fatal(TransportContext.java:327)atsun.security.ssl.TransportContext.fatal(TransportContext.java:270)atsun.security.ssl.TransportContext.fatal(TransportContext.java:265)atsun.security.ssl.CertificateMessageT12CertificateConsumer.checkServerCerts(CertificateMessage.java:646)
at sun.security.ssl.CertificateMessage$T12CertificateConsumer.onCertificate(CertificateMessage.java:465) at sun.security.ssl.CertificateMessage$T12CertificateConsumer.onCertificate(CertificateMessage.java:465)atsun.security.ssl.CertificateMessageT12CertificateConsumer.consume(CertificateMessage.java:361)
at sun.security.ssl.SSLHandshake.consume(SSLHandshake.java:376)
at sun.security.ssl.HandshakeContext.dispatch(HandshakeContext.java:451)
at sun.security.ssl.HandshakeContext.dispatch(HandshakeContext.java:428)
at sun.security.ssl.TransportContext.dispatch(TransportContext.java:184)
at sun.security.ssl.SSLTransport.decode(SSLTransport.java:154)
at sun.security.ssl.SSLSocketImpl.decode(SSLSocketImpl.java:1198)
at sun.security.ssl.SSLSocketImpl.readHandshakeRecord(SSLSocketImpl.java:1107)
at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:400)
at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:372)
at org.jivesoftware.smack.tcp.XMPPTCPConnection.proceedTLSReceived(XMPPTCPConnection.java:810)
at org.jivesoftware.smack.tcp.XMPPTCPConnection.access$1200(XMPPTCPConnection.java:151) at org.jivesoftware.smack.tcp.XMPPTCPConnection$1200(XMPPTCPConnection.java:151)atorg.jivesoftware.smack.tcp.XMPPTCPConnectionPacketReader.parsePackets(XMPPTCPConnection.java:1071)
… 3 more
Caused by: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
at sun.security.validator.PKIXValidator.doBuild(PKIXValidator.java:439)
at sun.security.validator.PKIXValidator.engineValidate(PKIXValidator.java:306)
at sun.security.validator.Validator.validate(Validator.java:271)
at sun.security.ssl.X509TrustManagerImpl.validate(X509TrustManagerImpl.java:312)
at sun.security.ssl.X509TrustManagerImpl.checkTrusted(X509TrustManagerImpl.java:221)
at sun.security.ssl.X509TrustManagerImpl.checkServerTrusted(X509TrustManagerImpl.java:128)
at sun.security.ssl.CertificateMessage$T12CertificateConsumer.checkServerCerts(CertificateMessage.java:630)
… 17 more
Caused by: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
at sun.security.provider.certpath.SunCertPathBuilder.build(SunCertPathBuilder.java:141)
at sun.security.provider.certpath.SunCertPathBuilder.engineBuild(SunCertPathBuilder.java:126)
at java.security.cert.CertPathBuilder.build(CertPathBuilder.java:280)
at sun.security.validator.PKIXValidator.doBuild(PKIXValidator.java:434)
… 23 more

在/etc/jitsi/jicofo/sip-communicator.properties中添加org.jitsi.jicofo.ALWAYS_TRUST_MODE_ENABLED=true
在重启jicofo

已解决：我的是手动根据源码编译安装的，在~/.sip-communicator/sip-communicator.properties
这个文件（没有这个文件可以手动创建这个文件）里添加 org.jitsi.jicofo.ALWAYS_TRUST_MODE_ENABLED=true 。