我在尝试推或拉时突然开始收到以下错误消息：
ssh: connect to host github.com port 22: Operation timed out
fatal: Could not read from remote repository.
Please make sure you have the correct access rights
and the repository exists.
如何检查我是否拥有“正确的访问权限”？我已经在这个存储库上工作了很长一段时间并且从未遇到过问题。
我究竟做错了什么？