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Yahoo Mail: "Temporary error 15"
Unsupported browser or too many open sessions
Yahoo Mail shows this error instead of your inbox. Yahoo says it usually clears up within a few minutes to a few hours, and it is often caused by an unsupported browser or by the account being open in several browsers or devices at once.
How to fix "Temporary error 15"
Restart your web browser.
Clear your browser's cache.
Make sure your browser and operating system are supported by Yahoo Mail.
Sign out of Yahoo Mail on all devices, then sign back in.
If the error keeps coming back, use the Yahoo Mail app or your phone's mail app for now.
From Yahoo Mail's help pages: help.yahoo.com, in our words. Checked on 5 November 2026. If the steps do not help, Yahoo Mail's own support is the next stop.
More Yahoo Mail errors and common problems
- Not syncing in iPhone MailBroken connection settings in Apple's Mail app
- Can't sign inWrong password, account lock or browser cookies
- Not working in other appsSecurity changes block third-party email apps
- Emails not arrivingBlocked senders, filters or spam settings
- App not showing new mailOutdated app or lost connection to Yahoo
- Good emails going to spamSpam filter catches messages you want
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