Cause DEDECMS background login verification code error analysis

I believe many users may encounter problems such as failure to display verification codes or continuous errors when logging on to the background of Zhimeng. How can this problem be solved. Here are a few tips and reasons.

 

(1) the space is full.

 

The first reason is that it is generally very difficult, that is, whether your host space is full, which is basically the cause of this problem.

 

(2) clear cache

 

Just like a browser, if you visit a website for a long time, the browser automatically identifies the website as a frequently accessed website and stores it in the cache. In this case, the result is that the verification code you entered is incorrect. So how can we clean up the cache? It's easy to go to your host space or FTP management. In the data/sessiondirectory, all files except the index.html homepage file are deleted. Of course, the browser cache must be cleared first.

 

(3) modify configuration parameters

 

Data/safe/inc_safe_config.php open the first line, and change $ safe_gdopen = & lsquo; 1, 2, 3, 4, 5, 6 & rsquo;
$ Safe_gdopen = & lsquo; 1, 2, 3, 4, 5 & rsquo; remove 6, that is, disable the backend verification code option. (This is a permanent method, which means that your verification code has never been used .)

 

(4) modify the PHP version

 

Here, the modified version refers to a version downgrade, not a version upgrade. How can we modify it? This is because the control panel on each space is different. Here, I will use the cpanel control panel of host 91 as a demonstration.

 

Click the PHP version.

 

 

Then select the version. Note that the version of Zhimeng is continuously updated. The result is that the old version is more stable, so here we will adopt a version downgrade method to solve this problem. The new version of php and dede are usually not compatible with some settings.

 

 

(5) Modify file permissions

 

Another solution is to modify the folder permissions of the session file as follows.

 

 

Click Perms and change the permission to 777.