Service temporarily overloaded 502 error . How to fix this?
You cannot do anything with this error. The problem is in their website, it already reached its maximum bandwidth load for the month. Every website has its own bandwidth limit to maintain.
The bandwidth applies for the whole month. If the website’s bandwidth hits the limit, its connection gets cut. No one can access the site unless the administrator or the owner of the site pays additional fee to increase their bandwidth.
If a website’s bandwidth overloaded, let say it happened first week of the month, the website’s connection is suspended for the rest of the month. And resumes the following month.
Just try monitoring the site’s connection if when will it be accessible again. Since it is a banking site, I’m sure it will be up again soon. They don’t want customers to be frustrated and waiting.