COG database download error (part-1)
No problem whatsoever for me, which means nothing is wrong with the remote file:
Length: 645588664 (616M) (unauthoritative)
[====================================================================================================>] 615.68M 10.4MB/s in 63s
2021-02-18 00:32:22 (9.73 MB/s) - 'cog-20.fa.gz' saved 
cog-20.fa.gz: gzip compressed data, was "cog-20.fa", last modified: Wed Nov 25 13:31:47 2020, from Unix, original size modulo 2^32 1396259395
The last command unpacks the archive just fine. If you have
curl, maybe this will work better:
curl -O ftp://ftp.ncbi.nih.gov/pub/COG/COG2020/data/cog-20.fa.gz
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Thank you very much Dlakic. There is probably an internet connection error.