Stack deployment from Git via Portainer Agent: http2: frame too large

[ranger81]

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Hello,
I'm trying to deploy a stack from Git source. If I do this with the local running Portainer Community Edition 2.21.5, it works perfectly fine.

But, if I try the same from another Portainer instance through a Portainer Agent (everything on 2.21.5), the stack deployment fails with the error:

Failed to deploy a stack: Service proxy Building listing workers for Build: failed to list workers: Unavailable: connection error: desc = "error reading server preface: http2: frame too large"

For me, it seems to be related with the Portainer Agent somehow, because on the local Portainer instance (without using the agent), the deployment works as expected.

Portainer container logs show:
2025/02/14 04:20PM WRN github.com/portainer/portainer/pkg/libstack/compose/internal/composeplugin/composeplugin.go:171 > docker compose command failed | error="exit status 17" error_output=" Service proxy Building\nlisting workers for Build: failed to list workers: Unavailable: connection error: desc = \"error reading server preface: http2: frame too large\"\n" output= {"time":1739550697,"message":"http: proxy error: dial tcp 192.168.171.26:9001: connect: connection refused"} {"time":1739550697,"message":"http: proxy error: dial tcp 192.168.171.26:9001: connect: connection refused"} {"time":1739550697,"message":"http: proxy error: dial tcp 192.168.171.26:9001: connect: connection refused"} {"time":1739550698,"message":"http: proxy error: dial tcp 192.168.171.26:9001: connect: connection refused"} {"time":1739550698,"message":"http: proxy error: dial tcp 192.168.171.26:9001: connect: connection refused"} {"time":1739550698,"message":"http: proxy error: dial tcp 192.168.171.26:9001: connect: connection refused"} {"time":1739550700,"message":"http: proxy error: dial tcp 192.168.171.26:9001: connect: connection refused"} {"time":1739550700,"message":"http: proxy error: dial tcp 192.168.171.26:9001: connect: connection refused"} {"time":1739550700,"message":"http: proxy error: dial tcp 192.168.171.26:9001: connect: connection refused"} {"time":1739550704,"message":"http: proxy error: dial tcp 192.168.171.26:9001: connect: connection refused"} {"time":1739550704,"message":"http: proxy error: dial tcp 192.168.171.26:9001: connect: connection refused"} {"time":1739551430,"message":"http: proxy error: EOF"} {"time":1739551430,"message":"http: proxy error: dial tcp 192.168.171.26:9001: connect: connection refused"} {"time":1739551431,"message":"http: proxy error: dial tcp 192.168.171.26:9001: connect: connection refused"} {"time":1739551433,"message":"http: proxy error: dial tcp 192.168.171.26:9001: connect: connection refused"} {"time":1739551437,"message":"http: proxy error: dial tcp 192.168.171.26:9001: connect: connection refused"}

Edit: Just found out, that if I include DOCKER_BUILDKIT=0 as an environment variable, it works... But I'm unsure what that means?!

Do you have any hints for me?
Thanks