[FIXED] Connect to repo.maven.apache.org:443 failed

Issue

I'm trying to build a spring-boot maven project from a jenkins pipeline.

Error:

ERROR: Failed to parse POMs
org.apache.maven.project.ProjectBuildingException: Some problems were encountered while processing the POMs:
[FATAL] Non-resolvable parent POM for xxx.xxxxx.xxxx:finance-portal:0.0.1-SNAPSHOT: 
 Failure to transfer org.springframework.boot:spring-boot-starter-parent:pom:2.4.2 
 Original error: Could not transfer artifact org.springframework.boot:spring-boot-starter-parent:pom:2.4.2 
 from/to central (https://repo.maven.apache.org/maven2): 
 Connect to repo.maven.apache.org:443 [repo.maven.apache.org/151.101.24.215] failed: 
 Connection refused (Connection refused) and 'parent.relativePath' points at no local POM @ line 6, column 10

maven goal:

clean install -U -X

pom.xml:

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.4.2</version>
    <relativePath /> <!-- lookup parent from repository -->
</parent>

The resolutions I tried so far:

1. Setting up org proxy through settings.xml file in jenkins and use the config in the pipeline.

2. Setting up proxies through maven goal: clean install -DproxySet=true -DproxyHost=proxy.com -DproxyPort=xxxxx.

3. Omitting/Changing relativePath tag in pom.xml to <relativePath>../pom.xml</relativePath> and few other variants.

4. Remove jenkins workspace for the project and re-build it.

5. make a curl request to maven central repo before the build to check connection establishment: curl -I -x proxy.com:xxxxx "https://repo.maven.apache.org/maven2". The connection gets established but fails in the build process.

Solution

While 30thh's answer was definitely helpful for troubleshooting, as a last resort I just cloned a working VM to a new instance, created my pipeline there and it worked like a charm in the first attempt. So it's pretty evident that it was something to do with proxy/firewall of the previous VM/jenkins.

Answered By - izengod