Resolving the "Cannot handle address family" issue when Dnu restore

The previous few days when installing the NuGet package with the Dnu Restore command in mono-based DNX, I encountered an "cannot handle address family" error with the following error details:

Cannot handle address family 61712stacktrace:at <unknown> <0xffffffff> at (wrapper managed-to-native) Syste M.net.dns.gethostbyname_internal (string,string&,string[]&,string[]&) <0xffffffff> at System.Net.Dns.GetHostByName (String) <0x00054> at System.Net.ServicePoint.get_HostEntry () <0x00219> at System.Net.WebConnection.Connect (System.Net.HttpWebRequest) <0x001d4> at System.Net.WebConnection.InitConnection (object) <0x002ea> at system.net.webconnection.<webconnection> M__0 (object) <0x00024> at System.Runtime.Remoting.Messaging.AsyncResult.WaitCallback_Context (object) < 0x00058> at System.Threading.ExecutionContext.RunInternal (System.Threading.ExecutionContext, System.threading.contextcallback,object,bool) <0x001c6> at System.Threading.ExecutionContext.Run ( System.threading.executioncontext,system.threading.contextcallback,object,bool) <0x00020> at System.Runtime.Remoting.Messaging.AsyncResUlt.<asyncresult>m__0 (object) <0x00022> at (wrapper Runtime-invoke) <module>.runtime_invoke_void_ _this___object (object,intptr,intptr,intptr) <0xffffffff>native Stacktrace:mono () [0x4a1ce8]/lib/x86_64- linux-gnu/libpthread.so.0 (+0x10340) [0x7f96c8e7e340]/lib/x86_64-linux-gnu/libc.so.6 (gsignal+0x39) [ 0x7f96c8adfcc9]/lib/x86_64-linux-gnu/libc.so.6 (abort+0x148) [0x7f96c8ae30d8]mono () [0x6318c6]mono () [0X6316B3] Mono () [0x631769]mono () [0x62b0b5]mono () [0x57a5e6][0x40bb793e]debug info from gdb:================================= ================================got a SIGABRT while executing native code. This usually Indicatesa fatal error on the Mono runtime or one of the native libraries used by your application.========== =======================================================

After submitting the issue on GitHub, I learned from the reply that this is a bug of mono, someone has submitted this bug to mono, see use "Dns.gethostentry" or "Dns.gethostbyname", Sometim E throw error "Cannot handle address family xxxxx".

There was always a mistake, and I couldn't finish dnu restore. Later, after a period of time to operate again, suddenly good.

Later, encountered several times this problem, all is the mistake, after a period of time is good.

Today again encountered, suddenly think, is not the reason for DNS caching, clear the DNS cache to try.

Service NSCD Restart

After restarting NSCD, the error disappears immediately.

To further confirm that this was really the reason, a method was found to reproduce the problem-delete the ~/.dnx/packages folder and recompile the DNX.

During the DNX compilation process Dnu restore, multiple occurrences of the "Cannot handle address family" issue, each time can be resolved through the service NSCD restart.

Resolving the "Cannot handle address family" issue when Dnu restore