Using maven-release-plugin with GitHub "You can't push to git://github.com/..."

Question

Recently having switched source code repository for a project to GitHub from SourceForge I need to update the maven release process to match. I followed this link for configuring the "scm" section of the pom. The GitHub repository is shown here. Everything else is as it was when using SVN (for publishing to https://docs.sonatype.org/display/Repository/Sonatype OSS Maven Repository Usage Guide#SonatypeOSSMavenRepositoryUsageGuide-4.MavenRepositories). So then I invoke

mvn clean release:clean release:prepare release:perform

and the output is as follows

[INFO] --- maven-release-plugin:2.1:prepare (default-cli) @ datanucleus-maven-parent ---
[INFO] Verifying that there are no local modifications...
[INFO]   ignoring changes on: pom.xml.next, release.properties, pom.xml.releaseBackup, pom.xml.backup, pom.xml.branch, pom.xml.tag
[INFO] Executing: /bin/sh -c cd /home/andy/work/datanucleus/datanucleus-maven-parent && git status
[INFO] Working directory: /home/andy/work/datanucleus/datanucleus-maven-parent
[INFO] Checking dependencies and plugins for snapshots ...
What is the release version for "DataNucleus Maven parent project"? (org.datanucleus:datanucleus-maven-parent) 3.3: : 
What is SCM release tag or label for "DataNucleus Maven parent project"? (org.datanucleus:datanucleus-maven-parent) datanucleus-maven-parent-3.3: : 
What is the new development version for "DataNucleus Maven parent project"? (org.datanucleus:datanucleus-maven-parent) 3.4-SNAPSHOT: : 
[INFO] Transforming 'DataNucleus Maven parent project'...
[INFO] Not generating release POMs
[INFO] Executing goals 'clean verify'...
[INFO] Executing: /bin/sh -c cd /home/andy/work/datanucleus/datanucleus-maven-parent && /usr/local/maven3/bin/mvn clean verify --no-plugin-updates -Psonatype-oss-release -P development
    [WARNING] Command line option -npu is deprecated and will be removed in future Maven versions.
    [INFO] Scanning for projects...
    [INFO]                                                                         
    [INFO] ------------------------------------------------------------------------
    [INFO] Building DataNucleus Maven parent project 3.3
    [INFO] ------------------------------------------------------------------------
    [INFO] 
    [INFO] --- maven-clean-plugin:2.4.1:clean (default-clean) @ datanucleus-maven-parent ---
    [INFO] Deleting /home/andy/work/datanucleus/datanucleus-maven-parent (includes = [*.log], excludes = [])
    [INFO] 
    [INFO] --- maven-enforcer-plugin:1.0:enforce (enforce-maven) @ datanucleus-maven-parent ---
    [INFO] 
    [INFO] --- maven-bundle-plugin:2.4.0:manifest (default) @ datanucleus-maven-parent ---
    [WARNING] Ignoring project type pom - supportedProjectTypes = [jar, bundle]
    [INFO] 
    [INFO] --- maven-source-plugin:2.1.2:jar-no-fork (attach-sources) @ datanucleus-maven-parent ---
    [INFO] 
    [INFO] --- maven-javadoc-plugin:2.7:jar (attach-javadocs) @ datanucleus-maven-parent ---
    [INFO] Not executing Javadoc as the project is not a Java classpath-capable package
    [INFO] 
    [INFO] --- maven-gpg-plugin:1.1:sign (sign-artifacts) @ datanucleus-maven-parent ---
    [INFO] ------------------------------------------------------------------------
    [INFO] BUILD SUCCESS
    [INFO] ------------------------------------------------------------------------
    [INFO] Total time: 1.535s
    [INFO] Finished at: Sat Dec 14 08:51:07 GMT 2013
    [INFO] Final Memory: 14M/491M
    [INFO] ------------------------------------------------------------------------
[INFO] Checking in modified POMs...
[INFO] Executing: /bin/sh -c cd /home/andy/work/datanucleus/datanucleus-maven-parent && git add -- pom.xml
[INFO] Working directory: /home/andy/work/datanucleus/datanucleus-maven-parent
[INFO] Executing: /bin/sh -c cd /home/andy/work/datanucleus/datanucleus-maven-parent && git status
[INFO] Working directory: /home/andy/work/datanucleus/datanucleus-maven-parent
[INFO] Executing: /bin/sh -c cd /home/andy/work/datanucleus/datanucleus-maven-parent && git commit --verbose -F /tmp/maven-scm-1907822841.commit pom.xml
[INFO] Working directory: /home/andy/work/datanucleus/datanucleus-maven-parent
[INFO] Executing: /bin/sh -c cd /home/andy/work/datanucleus/datanucleus-maven-parent && git symbolic-ref HEAD
[INFO] Working directory: /home/andy/work/datanucleus/datanucleus-maven-parent
[INFO] Executing: /bin/sh -c cd /home/andy/work/datanucleus/datanucleus-maven-parent && git push git://github.com/datanucleus/datanucleus-maven-parent.git master:master
[INFO] Working directory: /home/andy/work/datanucleus/datanucleus-maven-parent
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 6.885s
[INFO] Finished at: Sat Dec 14 08:51:07 GMT 2013
[INFO] Final Memory: 15M/491M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-release-plugin:2.1:prepare (default-cli) on project datanucleus-maven-parent: Unable to commit files
[ERROR] Provider message:
[ERROR] The git-push command failed.
[ERROR] Command output:
[ERROR] fatal: remote error:
[ERROR] You can't push to git://github.com/datanucleus/datanucleus-maven-parent.git
[ERROR] Use https://github.com/datanucleus/datanucleus-maven-parent.git

Now a connection of "scm:git:git://github.com/{organization}/{project}.git" is what all examples I've seen for maven-release-plugin so would appreciate any insight in why it doesn't work here, or what I could look at to find out why. I can do a git push to the same URL using the user I'm logged on here as (GitHub has the SSH key).

I tried swapping the scm connection/developerConnection over to https and then get username/password prompted and it then hangs (it updates the GitHub repo with the version without SNAPSHOT) but that's all.

Solution

Actually the problem was more of believing web links of how you should configure your SCM section, so I post the answer here in case anyone else hits this message. The connection/developerConnection should be of the form

scm:git:git@github.com:{organization}/{project}.git