The error message "421 DB connection failed. Try again later" is sent.

The error message "421 DB connection failed. Try again later" is sent. For example:

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This is generally caused by the failure of ODBC connection. First, test whether the ODBC connection is normal. The test method is as follows: Note: different commands of the system may be different)
Windows server 2003: Start ---run --odbcad32.exe.
Windows server 2008: in C: \ Windows \ SysWOW64 \ odbcad32.exe
-- System DSN ---- configuration ---- and test --- check whether the connection is normal. If the connection is normal, there will be a pretty prompt, such:

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Of course, this is a good situation. I will add 1 after the password, and then I will look at the error prompt:

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This prompt is a string. It's not as beautiful as above. If this is a prompt, your password is incorrect. Generally, umail passwords are stored in C: \ umail \ readme.txt (Note: This C disk refers to the umail installation disk ). You can find readme.txt and the password in it will be known. If you get to this step, copy the umail password. If the password is still prompted, You Need To directly use root to enter the mysql background. modified.
Start --- run --- cd C: \ umail \ mysql \ bin \ (this parameter is not explained)
?> Mysql-P 6033-u root-p (the password is also the root password in readme.txt .)
?> Enter password: (paste the password here)
?> User mysql;
?> Update user set password = password ('1qaz2wsx') where user = 'umail ';
?> Flush privileges;
?> \ Q
(As shown in the figure below: the root password of some tragic students is also forgotten, and the steps are also sent out. Skip the steps without any need)

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(Because the content is not necessary, it must start)
--- 1. Start ---- run --- services. msc --- (locate umailmysql and stop it)
--- 2. Start --- run --- cmd ---- cd c: \ umail \ mysql \ bin \
--- 3. mysqld-skip-grant-tables (Press enter. A prompt will pop up there)
--- 4. re-open --- start --- run ---- cmd --- cd C: \ umail \ mysql \ bin \
--- 5. mysqld-skip-grant-tables
--- 6.use mysql;
--- 7. update user set password = password ('000000') where user = 'root ';
--- 8. flush privileges;
--- 9. \ q
This will not be shown in the figure. It is no different from the above. Remember to log out or restart after the operation is complete.
After changing the password, you can find the password in the previous step. Then, you can enter the correct password in your odbcad32.exe and test it.
Open webmail now! If you change the password of umail in mysql. The following message is displayed:

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It indicates that the webmail password is incorrect, to C: \ umail \ worldclient \ html \ mainconfig. in php, change the password to the one you just changed and try again. Is it normal !!!

This article is from the mail server building blog, please be sure to keep this source http://mailyao.blog.51cto.com/3885985/1297003