I've got a problem with installing dependencies in my simple node.js project, when i launach yarn add express command then console throw me this error:

C:\Users\...\Desktop\npm-test>yarn add express
yarn add v1.22.4
[1/4] Resolving packages...
info There appears to be trouble with your network connection. Retrying...
info There appears to be trouble with your network connection. Retrying...
info There appears to be trouble with your network connection. Retrying...
info There appears to be trouble with your network connection. Retrying...
error An unexpected error occurred: "https://registry.npmjs.org/express: tunneling socket could not be established, cause=connect ETIMEDOUT 192.25.254.240:8080".
info If you think this is a bug, please open a bug report with the information provided in "C:\\Users\\...\\Desktop\\npm-test\\yarn-error.log".
info Visit https://yarnpkg.com/en/docs/cli/add for documentation about this command.

can someone tell me what is wrong? Thanks for any help!