RESTEASY004655: Unable to invoke request: org.apache.http.NoHttpResponseException: xyz.com:443(keycloak url) failed to respond

my connection code

KeycloakBuilder.builder().serverUrl(keycloakurl).realm(myCustomRealm) .clientId(privateclient).clientSecret(clientSecret) .grantType(OAuth2Constants.CLIENT_CREDENTIALS).resteasyClient(new ResteasyClientBuilder() .connectionPoolSize(10).build()

Facing issue while executing CI.

I am using RESTEASY: 3.9.1.FINAL

It appears that the ResteasyClient tries to use an already used connection instead of a new one. How can I fix this issue?