How do I fix certificate errors when running wget on an HTTPS URL in Cygwin

Question

For example  running wget https   www dropbox com results in the following errors   ERROR  The certificate of  www dropbox com  is not trusted  ERROR  The certificate of  www dropbox com  hasn t got a known issuer

User · Answer

If you are using windows just go to control panel  click on automatic updates then click on Windows Update Web Site link  Just follow the step  At least this works for me  no more certificates issue i e whenever I go to https   www dropbox com as before

User · Answer

If you don t care about checking the validity of the certificate just add the --no-check-certificate option on the wget command-line   This worked well for me   NOTE  This opens you up to man-in-the-middle  MitM  attacks  and is not recommended for anything where you care about security

User · Answer

Just do  apt-get install ca-certificate

User · Answer

May be this will help       wget --no-check-certificate https   blah-blah tld path filename

User · Answer

First  the SSL certificates need to be installed  Instructions  based on https   stackoverflow com a 4454754 278488    pushd  usr ssl certs curl http   curl haxx se ca cacert pem   awk  split after  1 n   split after 0   -----END CERTIFICATE-----   split after 1   print  gt   cert  n   pem    c rehash   The above is enough to fix curl  but wget requires an extra symlink   ln -sT  usr ssl  etc ssl

User · Answer

If the problem is that a known root CA is missing and when you are using ubuntu or debian  then you can solve the problem with this one line   sudo apt-get install ca-certificates

User · Answer

I have the similar problem and fixed it by temporarily disabling my antivirus Kaspersky Free 18 0 0 405   This AV has HTTPS interception module that automatically self-sign all certificates it finds in HTTPS responses   Wget from Cygwin does not know anything about AV root certificate  so when it finds that website s certificate was signed with non trust certificate it prints that error    To fix this permanently without disabling AV you should copy the AV root certificate from Windows certificate store to  etc pki ca-trust source anchors as  pem file base64 encoding  and run update-ca-trust

User · Answer

apt-get install ca-certificates    The s makes the difference

User · Answer

I had a similar problem with wget to my own live web site returning errors after installing a new SSL certificate  I d already checked several browsers and they didn t report any errors  wget --no-cache -O -  quot https   example com     quot  ERROR  The certificate of    example com    is not trusted  ERROR  The certificate of    example com    hasn t got a known issuer  The problem was I had installed the wrong certificate authority  pem  crt file from the issuer  Usually they bundle the SSL certificate and CA file as a zip file  but DigiCert email you the certificate and you have to figure out the matching CA on your own  https   www digicert com help  has an SSL certificate checker which lists the SSL authority and the hopefully matching CA with a nice blue link graphic if they agree   SSL Cert  Issuer   GeoTrust TLS DV RSA Mixed SHA256 2020 CA-1 CA  Subject GeoTrust TLS DV RSA Mixed SHA256 2020 CA-1 Valid from 16 Jul 2020 to 31 May 2023 Issuer  DigiCert Global Root CA

User · Answer

Looking at current hacky solutions in here  I feel I have to describe a proper solution after all   First  you need to install the cygwin package ca-certificates via Cygwin s setup exe to get the certificates    Do NOT use curl or similar hacks to download certificates  as a neighboring answer advices  because that s fundamentally insecure and may compromise the system   Second  you need to tell wget where your certificates are  since it doesn t pick them up by default in Cygwin environment  If you can do that either with the command-line parameter --ca-directory  usr ssl certs  best for shell scripts  or by adding ca directory    usr ssl certs to    wgetrc file   You can also fix that by running ln -sT  usr ssl  etc ssl as pointed out in another answer  but that will work only if you have administrative access to the system  Other solutions I described do not require that

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