Gradle failing to resolve PrimeFaces theme dependency: peer not authenticated - ssl

Question

I have a Gradle Java project in which I'm using JSF with PrimeFaces.
In order to change it's theme, I added the required dependency in my build.gradle file, which most important parts are configured as follows:
apply plugin: 'war'
apply plugin: 'eclipse-wtp'
sourceCompatibility = 1.8
version = '1.0'
jar {
manifest {
attributes 'Implementation-Title': 'Arch Project',
'Implementation-Version': version
}
}
repositories {
mavenCentral()
jcenter()
maven { url 'https://repository.primefaces.org' }
maven { url 'https://repository.jboss.org/nexus/content/groups/public' }
}
configurations {
provided
}
sourceSets {
main.compileClasspath += configurations.provided
test.compileClasspath += configurations.provided
test.runtimeClasspath += configurations.provided
}
dependencies {
/* Cryptography API for BCrypt algorithm. */
compile 'de.svenkubiak:jBCrypt:0.4'
/* Primefaces. */
compile 'org.primefaces:primefaces:5.3'
/* Primefaces pepper grinder theme. */
compile 'org.primefaces.themes:pepper-grinder:1.0.10'
... another few dependencies
}
However, when I run gradle build on the console I get the following error:
C:\Users\bruno.gasparotto\git\archproject\archproject>gradle build
:compileJava
FAILURE: Build failed with an exception.
* What went wrong:
Could not resolve all dependencies for configuration ':compile'.
> Could not resolve org.primefaces.themes:pepper-grinder:1.0.10.
Required by:
:archproject:1.0
> Could not HEAD 'https://repository.primefaces.org/org/primefaces/themes/pepper-grinder/1.0.10/pepper-grinder-1.0.10.pom'.
> peer not authenticated
What I've tried and didn't work so far:
Changed the dependency from pepper-grinder to all-themes.
Replaced https with http on PrimeFaces repo configuration in my build.gradle file.
Also, it's important to mention that:
The url https://repository.primefaces.org/org/primefaces/themes/pepper-grinder/1.0.10/pepper-grinder-1.0.10.pom is available if I try to access it through the browser.
I am NOT behind a proxy.
If I remove the pepper-grinder dependency, it works just fine.
The same setup used to work more than year ago, so I believe something new is happening.
Any ideas?
Thanks is advance.