If you have been trying to get into your Yahoo mail and ever gotten Error 999 message, then you will know how annoying this is as it is the only thing stopping you from reading all of your email messages. As Error 999 appears to be Yahoo Mail specific the and there is not a lot of information pertaining to this specific code, however many people have thought that this, Error 999, is the generic error code for a multiple number of common problems related to their mail system itself, or a bandwidth limit that has been surpassed by the user.
Many times Error code 999 will appear if your system has some type of malware or malicious program on it hat is attempting to access Yahoo mail with more requests than what Yahoo deems normal for their users. If this is the case the best thing to do is to do a full system scan with a security program.
Another thing that can help to resolve Error 999 is to do a full system scan with a registry cleaner as many times there can be core issues within the registry that can cause the system to act incorrectly. If there are any issues within the registry related to the internet browser being used it could cause multiple requests to be sent and then create Error 999. Registry cleaners not only will help to resolve Error 999 but also can assist with speeding up your internet connection as well as improving the overall performance of your entire system.
If neither of these options have helped to resolve the program the next thing to do is to try to use a different internet browser to contact Yahoo Mail and try to avoid Error 999. Options include Opera, Internet Browser, FireFox, and Google Chrome.
A final option to try to avoid encountering Error 999 is to change the location and computer that you are using to try to get access to your E-Mail. As the error code appears to be related to ip address, there is a possibility that Error 999 message could be avoided by changing the ip or location of the area where you are trying to access your email.