[bitbake-devel] WARNING: XXXXXX do_fetch: Failed to fetch URL http://xxxxxxx.tar.xz, attempting MIRRORS if available

[Sitech]

Hi,
When I build my yocto project, I often get a  same warning like this : 



 WARNING: quilt-native-0.65-r0 do_fetch: Failed to fetch URL http://download.savannah.gnu.org/releases/quilt/quilt-0.65.tar.gz, attempting MIRRORS if available
WARNING: attr-native-2.4.47-r0 do_fetch: Failed to fetch URL http://download.savannah.gnu.org/releases/attr/attr-2.4.47.src.tar.gz, attempting MIRRORS if available
WARNING: flex-native-2.6.0-r0 do_fetch: Failed to fetch URL http://downloads.sourceforge.net/flex/flex-2.6.0.tar.bz2, attempting MIRRORS if available
WARNING: xz-native-5.2.3-r0 do_fetch: Failed to fetch URL http://tukaani.org/xz/xz-5.2.3.tar.gz, attempting MIRRORS if available
WARNING: util-linux-native-2.30-r0 do_fetch: Failed to fetch URL http://cdn.kernel.org/pub/linux/utils/util-linux/v2.30/util-linux-2.30.tar.xz, attempting MIRRORS if available
WARNING: python3-native-3.5.3-r1.0 do_fetch: Failed to fetch URL http://www.python.org/ftp/python/3.5.3/Python-3.5.3.tar.xz, attempting MIRRORS if available
WARNING: popt-native-1.16-r3 do_fetch: Failed to fetch URL http://rpm5.org/files/popt/popt-1.16.tar.gz, attempting MIRRORS if available
WARNING: libpng-native-1.6.31-r0 do_fetch: Failed to fetch URL http://downloads.sourceforge.net/project/libpng/libpng16/1.6.31/libpng-1.6.31.tar.xz, attempting MIRRORS if available
WARNING: shadow-4.2.1-r0 do_fetch: Failed to fetch URL http://pkg-shadow.alioth.debian.org/releases/shadow-4.2.1.tar.xz, attempting MIRRORS if available
WARNING: acl-2.2.52-r0 do_fetch: Failed to fetch URL http://download.savannah.gnu.org/releases/acl/acl-2.2.52.src.tar.gz, attempting MIRRORS if available
WARNING: linux-libc-headers-4.12-r0 do_fetch: Failed to fetch URL http://cdn.kernel.org/pub/linux/kernel/v4.x/linux-4.12.tar.xz, attempting MIRRORS if available
WARNING: freetype-2.8-r0 do_fetch: Failed to fetch URL http://downloads.sourceforge.net/freetype/freetype-2.8.tar.bz2, attempting MIRRORS if available
WARNING: curl-native-7.58.0-r0 do_fetch: Failed to fetch URL http://curl.haxx.se/download/curl-7.58.0.tar.bz2, attempting MIRRORS if available
WARNING: perl-native-5.24.1-r0 do_fetch: Failed to fetch URL http://www.cpan.org/src/5.0/perl-5.24.1.tar.xz, attempting MIRRORS if available


And then, build failed, actually, the target file is accessable,  maybe my net connect is to low. So my operation is that remove ${TMPDIR} and rebuild the project by using $bitbake <target> command. But that's really cost to much time. Does any friend have other methods or good advices?


Thanks
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