Hi, Default port when making html call is 80, if that is changed you
have to provide the port number on the instance url.Let's say you are
using windows IIS for redirection, default site in IIS will have 80. If
you are using the default site for campaign redirection, you can access
instance without port, else you have to provide the port that is used on
that site.Check if your redirection config might have recently changed
by some one. -Prasanna.