I will try to describe this the best I can. I have a Canadian Ale in the secondary. I racked it over about 2 weeks ago. Within the last 2 days a white ;ooking scum formed on the inside wall of the carboy??? Looks real thick on the bottom of the carboy. I opened it and it smelled fine. I will try to a picture and post it. If was contaminated would ther be a bad smell??
An infection will generally form on the top of the beer. You can always carefully pull a sample from the fermenter and taste it. It won't hurt you, and might give you an indication of whether there is an infection or not.
It did not look like that. There was just some where the ridges are around the carboy. Getting ready to bottle it. Opened it up and it smelled a little yeasty no fowl oders. Will try to upload a pic as soon as i figure out how to.