Troubleshooting

What you see, what it usually means, and what to do. Most of it is the camera's Wi-Fi.

Starting up

What you see	What it usually means	What to do
No camera found on this network	The camera's Wi-Fi is not started, or the PC is not on the camera's network. The page is served anyway	On the camera: Camera Control API → Connect. On the PC: join the camera's Wi-Fi. Then press Connect in the top right of the page
The page loads but says No camera yet	The same	As above; the page needs no restart
ablecamera is not recognised	PowerShell was not reopened after installing Python	Close PowerShell, open it again
The camera's network will not accept the password	Canon made a new password when a connection was added on the camera	On the camera use Connect → the saved connection; or re-join with the password now on its screen
No Camera Control API entry in the camera's Wi-Fi menu	The API was never activated	Step 1 of Getting started, with the PC online
discover finds nothing but the page works	The page is already holding the camera; only one client is allowed	Nothing is wrong

While using it

What you see	What it usually means	What to do
The camera stops answering after about 30 seconds	Auto power off - the factory setting - and the app is not connected	Start the page; it switches auto power off off while connected and puts it back after
Everything answers 502	Something is polling the camera too hard, or a second app is connected	Close Canon's apps; one client at a time
The live picture is slow or stutters	The camera's radio is 2.4 GHz only	Expected. Shrink the picture with Smaller; use Check focus for detail
The level or histogram says Reading is 4 seconds old	The camera's own menu is open, or the picture stopped	Close the camera's menu; the reading resumes by itself
Not focused after Focus now	The lens could not find focus where it was pointed	Press the picture on something with contrast, or move closer
The focus buttons are missing	The camera is in manual focus, which the API cannot switch it out of	Change it in the camera's focus menu, or the lens's AF/MF switch where it has one
Check focus says the camera is not recording a JPEG	The camera records only RAW, or HDR PQ is on (HEIF)	Press Record a JPEG as well
A preset applied with one setting different	The mounted lens or body cannot do that value	Nothing to do; the page named the nearest it could
The dials are missing and the page mentions a Basic Zone	The mode dial is on SCN, A+ or a creative filter and the camera is setting the exposure itself	R50: the app takes the dial when you connect. R100: turn the dial to M by hand

The page is slow to open on the PC

Windows takes a fixed ~14 seconds on its first lookup of a .local name. On the PC itself use http://127.0.0.1:8720/ — the address the app prints first — or the 192.168.… address. Phones resolve .local names instantly.

If the PC's Wi-Fi adapter has been given the camera's address as a DNS server, every name lookup on that adapter waits on the camera, which reads as ten-second stalls on every press. Reset the adapter to automatic DNS.

Signing in and syncing

What you see	What it means
Invalid credentials.	The email or password is wrong; the address is kept, only the password cleared
Email not verified.	The link sent when the account was created has not been opened yet
App is not enabled for this workspace.	Your account exists but has not been given this app - ask whoever administers it
Could not reach https://…	No internet from this machine right now; presets still work locally
The sign-in has expired. Sign in again.	The platform no longer knows the old sign-in; nothing else changed

What the app changes on the camera

Only two things, both said on the page and both put back when it stops: auto power off (disabled while connected) and, on an R50, the mode dial (held and set to M). If the app was stopped abruptly and the camera seems stuck — buttons doing nothing, or sleeping too soon — turning the camera off and on restores both.