Generally, this error code 205.4 can be caused by a few basic problems. First of all, a poor network connection can cause the code to appear. If your network is unstable, you may be experiencing this issue. To fix the problem, contact your internet service provider and ask them to reset your modem or router. This can solve the issue and fix the network connection. If the problem persists, you should contact the technical support team of AT&T and request a new password.