javascript - Cross-domain SSO login sometimes requires clearing the browser's cookies before logging in. Why?

Question

Question: A colleague of mine was able to log in successfully yesterday using 360 Browser, but suddenly he couldn't log in when he came to work this morning. After that, I asked him to clear the cookies of the browser, and he was able to log in after that. Why? (Note: The system uses cross-domain SSO login)

世界只因有你 · Answer

The problem description is not clear.
1. If you can't log in, does it mean the system or the cas? 2. Whose cookies are you cleaning? Theoretically, no matter which party's cookie validity period is too short, it will not cause this problem!

巴扎黑 · Answer

Cookie names may be duplicated, causing problems in determining login status

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