Build fails to resolve plugin dependencies during planned tls 1.0 deprecation

Hi,

we have the same issue from today

Plugin [id: 'net.researchgate.release', version: '2.6.0'] was not found in any of the following sources:

- Gradle Core Plugins (plugin is not in 'org.gradle' namespace)
- Plugin Repositories (could not resolve plugin artifact 'net.researchgate.release:net.researchgate.release.gradle.plugin:2.6.0')
  Searched in the following repositories:
    Gradle Central Plugin Repository

checking with --debug flag it appears to be ssl connection problem to gradle.
Maybe is just part of the migration and it might work tomorrow or it needs more investigation on gradle side.

for passing artifact

Connecting socket to plugins.gradle.org/104.18.191.9:443 with timeout 30000
    Starting handshake
    07:45:02.490 [DEBUG] [org.apache.http.conn.ssl.SSLConnectionSocketFactory] Secure session established
    07:45:02.490 [DEBUG] [org.apache.http.conn.ssl.SSLConnectionSocketFactory]  negotiated protocol: TLSv1.3
    07:45:02.490 [DEBUG] [org.apache.http.conn.ssl.SSLConnectionSocketFactory]  negotiated cipher suite: TLS_AES_128_GCM_SHA256
    07:45:02.495 [DEBUG] [org.apache.http.conn.ssl.SSLConnectionSocketFactory]  peer principal: CN=gradle.org, O="CloudFlare, Inc.", L=San Francisco, ST=CA, C=US
    07:45:02.495 [DEBUG] [org.apache.http.conn.ssl.SSLConnectionSocketFactory]  peer alternative names: [*.gradle.org, gradle.org]
    07:45:02.496 [DEBUG] [org.apache.http.conn.ssl.SSLConnectionSocketFactory]  issuer principal: CN=CloudFlare Inc ECC CA-2, O="CloudFlare, Inc.", L=San Francisco, ST=CA, C=US
    07:45:02.497 [DEBUG] [org.apache.http.impl.conn.DefaultHttpClientConnectionOperator] Connection established 10.49.17.206:60302<->104.18.191.9:443

for failing ones

Connecting socket to plugins.gradle.org/104.18.190.9:443 with timeout 30000
Starting handshake
07:45:03.668 [DEBUG] [org.apache.http.conn.ssl.SSLConnectionSocketFactory] Secure session established
07:45:03.668 [DEBUG] [org.apache.http.conn.ssl.SSLConnectionSocketFactory]  negotiated protocol: TLSv1.3
07:45:03.668 [DEBUG] [org.apache.http.conn.ssl.SSLConnectionSocketFactory]  negotiated cipher suite: TLS_AES_128_GCM_SHA256
07:45:03.668 [DEBUG] [org.apache.http.conn.ssl.DefaultHostnameVerifier] peer not authenticated
javax.net.ssl.SSLPeerUnverifiedException: peer not authenticated

for the other plugin that it passes also goes to the 104.18.190.9:443 (in some builds) without problem

tried a few times, and always on the artifact Plugin [id: ‘net.researchgate.release’, version: ‘2.6.0’] fails

build machine

------------------------------------------------------------
Gradle 5.4.1
------------------------------------------------------------

Build time:   2019-04-26 08:14:42 UTC
Revision:     261d171646b36a6a28d5a19a69676cd098a4c19d

Kotlin:       1.3.21
Groovy:       2.5.4
Ant:          Apache Ant(TM) version 1.9.13 compiled on July 10 2018
JVM:          11 (Oracle Corporation 11+28)