Leak from engine connector - diagnosis required




My car recently turned over 150000km. Opened up the hood today and saw some dried up stuff at the location where a pipe connects to the engine. Any idea what that pipe carries and should I be worried about this dried up leak?
Any advice/suggestions are welcome.
Thanks.
Look for the red circles in the pics.









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Im going to clean up the mess and see how long it takes to happen again and then decide how quickly i should change it.
Thanks again for the info.
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