Thanks for that link with instructions for locating the log file.
I think that the problem is to do with the Thales UK coprorate proxy server using untrusted https certificates.
The normal solution for this with other tools (e.g. Android Studio) is to install the certificates to the tools. An alternative is to find the JRE that the tool is using and install the certificates to the keystore for that JRE using the java keytool. My log is as below.
!ENTRY com.nxp.swtools.kex.api.internal.MfactApiClient 4 0 2021-06-02 08:07:46.076
!MESSAGE [NETWORK] getProcessor - server not available or other error
!STACK 0
javax.net.ssl.SSLHandshakeException: 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.ssl.Alerts.getSSLException(Alerts.java:198)
at sun.security.ssl.SSLSocketImpl.fatal(SSLSocketImpl.java:1967)
at sun.security.ssl.Handshaker.fatalSE(Handshaker.java:331)
at sun.security.ssl.Handshaker.fatalSE(Handshaker.java:325)
at sun.security.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1688)
at sun.security.ssl.ClientHandshaker.processMessage(ClientHandshaker.java:226)
at sun.security.ssl.Handshaker.processLoop(Handshaker.java:1082)
at sun.security.ssl.Handshaker.process_record(Handshaker.java:1010)
at sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:1079)
at sun.security.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1388)
at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1416)
at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1400)
at sun.net.www.protocol.https.HttpsClient.afterConnect(HttpsClient.java:559)
at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.jav...)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1570)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1498)
at java.net.HttpURLConnection.getResponseCode(HttpURLConnection.java:480)
at sun.net.www.protocol.https.HttpsURLConnectionImpl.getResponseCode(HttpsURLConnectionImpl.java:352)
at com.nxp.swtools.kex.api.internal.HttpHelper.getHttpBinaryResponseWithRedirect(HttpHelper.java:151)
at com.nxp.swtools.kex.api.internal.HttpHelper.getHttpBinaryResponse(HttpHelper.java:94)
at com.nxp.swtools.kex.api.internal.HttpHelper.getHttpBinaryResponse(HttpHelper.java:187)
at com.nxp.swtools.kex.api.internal.HttpHelper.getHttpGetBinaryResponse(HttpHelper.java:200)
at com.nxp.swtools.kex.api.internal.HttpHelper.getHttpGetXmlResponse(HttpHelper.java:75)
at com.nxp.swtools.kex.api.internal.MfactApiClient.getProcessor(MfactApiClient.java:361)
at com.nxp.swtools.provider.processors.KExProcessorsProvider.listProcessor(KExProcessorsProvider.java:368)
at com.nxp.swtools.provider.processors.KExProcessorsProvider.getProcessorMasterToolInfo(KExProcessorsProvider.java:1335)
at com.nxp.swtools.provider.processors.KExProcessorsProvider.downloadOrUpdateProcessor(KExProcessorsProvider.java:613)
at com.nxp.swtools.provider.processors.KExProcessorsProvider.checkOrDownloadProcessor(KExProcessorsProvider.java:650)
at com.nxp.swtools.provider.processors.KExProcessorsProvider.checkOrDownloadCommonConfig(KExProcessorsProvider.java:882)
at com.nxp.swtools.utils.importer.PreparedImportStatus.preparePrjImport(PreparedImportStatus.java:156)
at com.nxp.swtools.sdkproject.ImportToolchainProjectFactory.lambda$1(ImportToolchainProjectFactory.java:166)
at java.util.LinkedHashMap$LinkedValues.forEach(LinkedHashMap.java:608)
at com.nxp.swtools.sdkproject.ImportToolchainProjectFactory.importSourcesFromProject(ImportToolchainProjectFactory.java:162)
at com.nxp.swtools.sdkproject.ImportToolchainProjectFactory.importToolchainProject(ImportToolchainProjectFactory.java:366)
at com.nxp.swtools.eclipse.handlers.OpenMexForProject.importToolchainConfigurationForProject(OpenMexForProject.java:129)
at com.nxp.swtools.eclipse.handlers.OpenMexForProject.lambda$1(OpenMexForProject.java:185)
at org.eclipse.jface.operation.ModalContext$ModalContextThread.run(ModalContext.java:122)
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:450)
at sun.security.validator.PKIXValidator.engineValidate(PKIXValidator.java:317)
at sun.security.validator.Validator.validate(Validator.java:262)
at sun.security.ssl.X509TrustManagerImpl.validate(X509TrustManagerImpl.java:330)
at sun.security.ssl.X509TrustManagerImpl.checkTrusted(X509TrustManagerImpl.java:237)
at sun.security.ssl.X509TrustManagerImpl.checkServerTrusted(X509TrustManagerImpl.java:132)
at sun.security.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1670)
... 32 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:445)
... 38 more