Data Import From Remote Server Fails with *** WARNING *** java.io.IOException: Method failed

Problem

Importing data from a remote server fails and generates below exceptions. It might be a scheduled import or even you click Load All Records on the Data Source record.

com.glide.db.impex.datasource.DataSourceException: com.glide.db.impex.datasource.DataSourceException: java.io.IOException: Method failed:(https://remoteserver/filename) null with code: 0 
at com.glide.processors.ImportProcessorWorker.loadDataSource(ImportProcessorWorker.java:181) 
at com.glide.processors.ImportProcessorWorker.startWork(ImportProcessorWorker.java:104) 
at com.glide.worker.AbstractProgressWorker.startAndWait(AbstractProgressWorker.java:86) 
at com.glide.worker.HierarchicalProgressWorker.startAndWait(HierarchicalProgressWorker.java:37) 
at com.glide.worker.ProgressWorkerThread.run(ProgressWorkerThread.java:53) 
Caused by: com.glide.db.impex.datasource.DataSourceException: java.io.IOException: Method failed: (https://remoteserver/filename) null with code: 0 
at com.glide.db.impex.datasource.DataSource.getFile(DataSource.java:312) 
at com.glide.db.impex.datasource.DataSource.getFile(DataSource.java:252) 
at com.glide.db.impex.CSVLoader.setDataSource(CSVLoader.java:127) 
at com.glide.db.impex.JDBCLoader.setImportDataSource(JDBCLoader.java:551) 
at com.glide.db.impex.datasource.CSVDataSource.getLoader(CSVDataSource.java:21) 
at com.glide.processors.ImportProcessorWorker.loadDataSource(ImportProcessorWorker.java:139) 
... 4 more 
Caused by: java.io.IOException: Method failed: (https://remoteserver/filename) null with code: 0 
at com.glide.protocol.http.HTTPURLConnection.connect(HTTPURLConnection.java:38) 
at com.glide.protocol.http.HTTPURLConnection.getInputStream(HTTPURLConnection.java:46) 
at com.glide.db.impex.datasource.DataSource.writeFile(DataSource.java:336) 
at com.glide.db.impex.datasource.DataSource.getFile(DataSource.java:305) 

Cause

It appears after customers apply ServiceNow Instance Hardening KB0550654 and set com.glide.communications.trustmanager_trust_all system property false as a part of 9.1 Certificate Trust.

By default, ServiceNow trusts a certificate's Certificate Authority, CA, which ensures ServiceNow accepts self-issued certificates. When customers set this property false and their remote server is secured with a self-sign Certificate Authority, not a trusted CA, this import fails because the platform does not allow this.

Solution

Customer can opt one of the following to fix this issue:

1. Set system property com.glide.communications.trustmanager_trust_all as true.
2. Or replace the self-signed certificate on their remote server with another one which is signed by a trusted CA.