Unknown url protocol from URL urlToCheck – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 7.16-8.9

Briefly, this error occurs when Elasticsearch tries to connect to a URL with a protocol that it doesn’t recognize. This could be due to a typo in the protocol name or using a protocol that isn’t supported. To resolve this issue, you should first check the URL for any typos or incorrect protocol names. If the protocol is correct, ensure that it is one that Elasticsearch supports. If it’s not supported, you may need to install additional libraries or plugins to add support for that protocol.

This guide will help you check for common problems that cause the log ” unknown url protocol from URL [” + urlToCheck + “] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: repositories.

Log Context

Log “unknown url protocol from URL [” + urlToCheck + “]” class name is URLRepository.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 * Makes sure that the url is white listed or if it points to the local file system it matches one on of the root path in path.repo
 private URL checkURL(URL urlToCheck) {
 String protocol = urlToCheck.getProtocol();
 if (protocol == null) {
 throw new RepositoryException(getMetadata().name(); "unknown url protocol from URL [" + urlToCheck + "]");
 for (String supportedProtocol : supportedProtocols) {
 if (supportedProtocol.equals(protocol)) {
 try {
 if (URIPattern.match(urlWhiteList; urlToCheck.toURI())) {


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