Frontend cannot contact backend about geoengine HOT 3 CLOSED

* curl http://localhost:3030/sessions    
{"error":"NotFound","message":"Not Found"}%  

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hi Claas,

sorry to hear that you can't connect the ui and the backend. I just checked geoengine:master and geoengiune-ui:main and it works fine for me.

For geoengine you only need to do "cargo run" it will run on port 3030.

For geoengiine-ui use
"ng build --configuration development wave-core-new --watch"
and
"ng serve --configuration development geoengine-app --proxy-config proxy-local.conf.json"
then the UI should work on port 4200.

The not found on localhost:3030 is ok.

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Finally I found the problem (kudos to @koerberm). When you have an ipv6 entry in /etc/hosts for localhost next to an ipv4 entry for localhost the frontend cannot connect to the backend. The backend prefers to listen in here on my my end:

* netstat -an | grep "3030"
tcp        0      0 127.0.0.1:3030          0.0.0.0:*               LISTEN

while the frontend listens in here:

* netstat -an | grep "4200"
tcp6       0      0 ::1:4200                ::1:46822               TIME_WAIT  

Then the communication fails (when you start the web ui then you land on the login page). When I remove that ipv6 entry everything works fine (you land in the geoengine right away)!

* netstat -an | grep "4200"
tcp        0      0 127.0.0.1:4200          0.0.0.0:*               LISTEN 

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