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Are you sure the server is up and accepting connection?

$ curl -v towel.blinkenlights.nl:23
*   Trying 213.136.8.188:23...
* TCP_NODELAY set
*   Trying 2001:7b8:666:ffff::1:42:23...
* TCP_NODELAY set
* Immediate connect fail for 2001:7b8:666:ffff::1:42: Network is unreachable
*   Trying 2001:7b8:666:ffff::1:42:23...
* TCP_NODELAY set
* Immediate connect fail for 2001:7b8:666:ffff::1:42: Network is unreachable
*   Trying 2001:7b8:666:ffff::1:42:23...

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@VishnuRathore98
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Answer selected by VishnuRathore98
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