The website background suddenly failed to log in. After debugging, it was found that the session writing failed. Please give me some advice as to what the problem may be.
Look at the PHP log or Apache/nginx log, and also check whether the server hard disk space is still available, and if using cache or database storage, check whether the cache is full of memory or whether the data table is locked by transaction locks.
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
Look at the PHP log or Apache/nginx log, and also check whether the server hard disk space is still available, and if using cache or database storage, check whether the cache is full of memory or whether the data table is locked by transaction locks.
Post the picture and take a look