heroku run rake db:migrate Error connecting to dyno - ruby-on-rails-4

I am new on ruby on rails. and am trying to deploy my application from my local system to heroku, but when i run heroku run rake db:migrate, i get this error msg:
Running rake db:migrate attached to terminal... up, run.7855
!
! Error connecting to dyno, see https://devcenter.heroku.com/articles/one-off-dynos#timeout-awaiting-process
I've followed the link to the site but i didn't understand what was said there. Please any help as to how deploy it successfully will be much appreciated.
Thank you

Seems like your have no access to rendezvous.runtime.heroku.com:5000
Ask your system administrators or internet service provider to allow this address and port for you
This problem solution already described at https://devcenter.heroku.com/articles/one-off-dynos#timeout-awaiting-process, but I didn't understand at once too :)
You can check access to necessary resource by telnet rendezvous.runtime.heroku.com 5000 command
Update:
Recently I encountered with problem when rendezvous.runtime.heroku.com:5000 is accessible but heroku run ... command doesn't work.
In this case command must be modified to heroku run:detached ...
It helped me, but interactive utilities like bash will not work because of output will be available only in logs

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i am trying to deploy spring application on cloudfoundry.but as a build war file of project using mvn package command.after that i used vmc push --appname target(directory)
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finally i got message uploading application-name....ok
then i entered command vmc apps
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advanced thanks....
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or
vmc files <app-name> logs/stderr.log
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deploy a node.js application to api.cloudfoundry.com. and got an error

Error 402: App packaging failed: 'Failed synchronizing resource pool'
I got this error when deploy a node.js application to api.cloudfoundry.com.
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I want to know how does this error happened. Is there something wrong with my vmc? or something wrong with my node.js application?
Thank you.
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