As of 8/21/2025 I can no longer upgrade my dApp on the ICP mainnet, canister id t5cvz-wiaaa-aaaaa-qag4q-cai subnet snjp4-xlbw4-mnbog-ddwy6-6ckfd-2w5a2-eipqo-7l436-pxqkh-l6fuv-vae WASM binary file is quiet weighty ~11mb but this -never- was an issue before, today after subnet was upgraded MOST of …

Did you turn off your canister and turn it on again?

No. It’s the raw size of the wasm binary, looks like I wasn’t using gzip with dfx But still… it never was an issue before, I think supporting bigger WASM files is important

I just tried gzipping and got binary size down to 4.4MB, it still fails with Caused by: The replica returned an HTTP Error: Http Error: status 503 Service Unavailable, content type “text/plain; charset=utf-8”, content: Unable to buffer body from time to time, but success rate is higher Something go…

Did the problem persist or did you manage to install all your canisters?

Hi. I’ve just tried to deploy again several times - issue seems to be resolved It works both with 4.4 gzipped WASM and with uncompressed WASM(~11mb) like it used to do. I wonder was it intermittent issue or some kind of fix was deployed? Any idea what was causing this?

I’m seeing this error again and a lot, please what can I do except reducing the WASM size?

If compressing the Wasm artifacts helps, then that’s your best option. You may also consider moving your dapp to another subnet, if this one is always busy.

Can this be helped on the node level? I think it’s important to support bigger WASM Why are we being so restrictive with this?

Cannot upgrade my dApp - 503 Service Unavailable, unable to buffer body

Developers

michael-weigelt September 12, 2025, 1:16pm 17

https://forum.dfinity.org/t/canister-snapshot-up-download/57397

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Cannot upgrade my dApp - 503 Service Unavailable, unable to buffer body

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