Q: Which special character should i avoid in password?
You can use special most special characters like e.g. !, #, _, ~ etc etc. , but you should avoid the \ (backslash). This character is also called the "escape character" and thus sometimes can make difficulties. We recommend that you use letters, numbers and simple (non-critical) special characters as stated before. If you want, you can change the password before migration to something easier like letters and numbers only, and after the migration change it back. This also provides higher security as the password gets changed more often.