Fetcher failure

Fetcher failure: Unable to find file file://universal/7c/55/sstate:ghostscript-native:x86_64-linux:9.55.0:r0:x86_64:10:7c551f38ac8ea1463406ea2cf1d5db7fad78d96f4215cec20e6474b886640ea1_populate_sysroot.tar.zst;downloadfilename=universal/7c/55/sstate:ghostscript-native:x86_64-linux:9.55.0:r0:x86_64:10:7c551f38ac8ea1463406ea2cf1d5db7fad78d96f4215cec20e6474b886640ea1_populate_sysroot.tar.zst anywhere. The paths that were searched were:\n', '   

During build preparation BB checks sstate mirror server but now this server fails or drop connections. Common cause is:

• max file descriptions reached by nginx
• ip conntrack table overloaded by http connections nf_conntrack: nf_conntrack: table full, dropping packet