Getting 404 from microservices in gateway front - jhipster

Question

I've created a microservices architecture following jhipster instructions. I have a gateway, the registry and a simple microservice. After that i've called the entity sub-generator in the gateway to generate the front-end code for the microservice.
After doing that, I can propertly create/list/update the microservice resources from the Administration-API section in the gateway, but in the 'Entities' section (via front-end) i'm getting a 404 in all the microservices requests.
The 3 apps are running in dev profile, and the jwt secret token is the same for all of them: my-secret-token-to-change-in-production. I have not touched the config ymls.
¿What could be the problem? 404 is not a security problem ¿Isn't it? ¿Maybe the problem is the proxy? I'm behind a proxy.
I follow the Julien Dubois video, https://www.youtube.com/watch?v=dOO-8cAKDu8 and he just re-generate the entity in the gateway to access the front-end via 'Entities' menu (minute 33 aprox).
Thank you!
Gateway generator options:
{
"generator-jhipster": {
"jhipsterVersion": "3.6.1",
"baseName": "testgw",
"packageName": "com.test.app",
"packageFolder": "com/test/app",
"serverPort": "8080",
"authenticationType": "jwt",
"hibernateCache": "hazelcast",
"clusteredHttpSession": "no",
"websocket": "no",
"databaseType": "sql",
"devDatabaseType": "h2Disk",
"prodDatabaseType": "mysql",
"searchEngine": "elasticsearch",
"buildTool": "maven",
"jwtSecretKey": "92bc8dd1e1cb0aacacfebe994abfb472862c512d",
"useSass": true,
"applicationType": "gateway",
"testFrameworks": [
"gatling",
"cucumber",
"protractor"
],
"jhiPrefix": "jhi",
"enableTranslation": true,
"nativeLanguage": "es",
"languages": [
"es",
"en"
]
}
}
Microservice generator options:
{
"generator-jhipster": {
"jhipsterVersion": "3.6.1",
"baseName": "patient",
"packageName": "com.test.app",
"packageFolder": "com/test/app",
"serverPort": "8081",
"authenticationType": "jwt",
"hibernateCache": "hazelcast",
"databaseType": "sql",
"devDatabaseType": "h2Disk",
"prodDatabaseType": "mysql",
"searchEngine": "elasticsearch",
"buildTool": "maven",
"jwtSecretKey": "f9e757eb9259f0cfd8886bb08beda392463a4391",
"enableTranslation": true,
"applicationType": "microservice",
"testFrameworks": [
"gatling",
"cucumber"
],
"jhiPrefix": "jhi",
"skipClient": true,
"skipUserManagement": true,
"nativeLanguage": "es",
"languages": [
"es",
"en"
]
}
}