A server with the specified hostname could not be found

When I try to submit my app on the App Store through Xcode I got this error.

> A server with the specified hostname could not be found.

Is this temporary error at Apple or something to do with Xcode?

Is anyone else facing this problem?

It might be DNS Pollution issue, at least for my case (in China).

If you're also in China or some places that has DNS Pollution issue, you might solve this by modifying the DNS (to 8.8.8.8 as an example) for your Mac as well.

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I got this error inner my iPad App & this happens randomly, it's such boring. Keep trying is not a good solution for me, though it might works somehow. Finally, I just changed my Wi-Fi DNS and no more error now. Steps:

1. Your device, Settings/Wi-Fi
2. Choose connected Wi-Fi pot
3. Press DHCP/DNS
4. Set to 8.8.8.8

In Xcode, select Target -> Capabilities, and check "Outgoing Connections (Client)" to enable App Sandbox.

Keep Trying!

I have had this a few times (including today), and each time, without changing anything, it has worked when I tried again.

Sometimes the 2nd time, other times 20 minutes later.

I received A server with the specified hostname could not be found.. I figured out my MacOS app had turned on App Sandboxing. The easiest way to avoid problem is to turn off Sandbox.

If the problem occured in a MacOS project, as @nstein commented in this answer just go to your Target's Signing & Capabilities and allow Incoming and Outgoing network options.

That fixed the problem for me, when trying to upgrade to El Capitan:

sudo softwareupdate --clear-catalog

For me it was an issue with enabling Outgoing connections in Capabilities tab.

I faced the same problem, it turned out to be VPN related. If you are testing on a device against a corporate network, chances are your Mac has proper VPN set up, but your phone does not. Connect phone to the corporate VPN for your apps deployed to device to see corporate servers.

I restarted my MacBook Pro and then I build again, the error was fixed.

I got this message when the device has mobile data turned on and no wifi connection, but the internet is not properly connected.

Try to connect to a wifi network with an internet connection or turning off the mobile data.

I faced same problem. Actually i face it often. Following three steps work for me always

1. Change DNS to 8.8.8.8 and 4.2.2.2
2. Open net.properties and change "# https.proxyPort=443" to "https.proxyPort=80". You can find net.properties here /Applications/Xcode.app/Contents/Applications/Application Loader.app/Contents/MacOS/itms/java/lib/net.properties
3. Open Application Loader->Preferences->Advanced and uncheck Signiant and Aspera. Make sure DAV is checked.

Thants all. Now you can submit app using both application loader and Xcode.

A server with the specified hostname could not be found.

I faced the same problem, In my case it was because of-

1. Server was not configured properly.
2. Server subscription has been expired

Contacting to server hosting company resolve my problem.

I think this is not temporary error at apple or something to do with Xcode?

First of all check your internet connection.. go to safari and check by searching something on google(dont try google.com only.. because it can be cached). If it is working fine, then try now in your app. It must work. This is fired while not having proper internet connection.

Just to share my experience

It was caused by the Sharing > Internet Sharing inside System Preferences

I was testing and created NAT64 Network unchecking it solved my problem.

I faced this issue when we changed from one domain to another for API service.

Restarting the network router/modem fixed this issue.

I got this error message when "/" from my URL is missing . Hope this help someone.

ex: actual URL is "https://www.myweb.com/login" .My URL which "https://www.myweb.comlogin" caused this error

Just restart your network router device.

> Obs. If it is already has automatic DNS settings.

Turn off the push notification. Then,Restart your XCode and Turn back ON the Push Notification. It works for me.