enter image description hereI am using ArcMap10.3. And it looks like the network analyst is locked (see screenshot attached).

I have the license, and the network analyst is activated an it is working for the tutorial but it doesn't work on other maps.

Any idea about how I could unlock it?

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    Please edit your question to include your screenshot – Midavalo Jul 5 '16 at 18:15
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    I don't see an attached screenshot. Is it possible someone else is/was using it (including yourself if you have another instance using it). You, or whoever is using it, may have to uncheck NA under Customize -> Extensions in the mxd using it. Alternately, if you have two different logins, one may have a license to use while another doesn't. – recurvata Jul 5 '16 at 18:49
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    Have you added Network Dataset to the Data Frame? You can't perform any Network Analysis without it. – Zsott Jul 6 '16 at 9:57
  • No, I though I could start without it and add it later, is there any way to import the Network Dataset from Open Street Map? – ales.singli Jul 6 '16 at 11:12
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    As far as I know you can't import Network Dataset from OSM. However you can download OSM routes to build your own Network Dataset. You can read about building NDs here: desktop.arcgis.com/en/arcmap/latest/extensions/network-analyst/… – Zsott Jul 7 '16 at 7:41

It's not locked. Just add a Network Dataset to the Data Frame. You can't perform any Network Analysis without one.

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