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Two printers went on printing while every archive they produced held nothing but a filename. Bambuddy opened port 990, the printer accepted the connection and answered with something that was not TLS, and connect() logged a warning and returned False -- indistinguishable, to every caller, from "the file is not at this path". So the 3MF lookup walked all six filename variants across five directories with four retries each, the cover endpoint ran its own sixteen-path sweep, and the timelapse scan added four more, all against a sixteen-path sweep, and the timelapse scan added four more, all against a printer that could not have answered any of them. One reporter's log carried 1813 identical handshake failures, another's 3511. The evidence says this is the printer's own file service getting stuck, not a model, firmware or TLS-configuration problem. In #2780's bundle the same two printers ran clean from 22 July to 4 August and failed again from the 5th; a second bundle shows an X2D serving files for five days, flipping on 19 July, then failing every connection for eight days with zero successes. The same models and firmware appear in roughly twenty other bundles with no occurrences at all. Both bundles show it happening with cap_tls_v1_2 in effect -- the X2D and H2C entries in ftp_profiles were added on analogy with P2S to fix exactly this symptom, and the reporter's own debug line proves they do not. An ssl.SSLError from connect() now opens a five-minute cool-off for that printer. Subsequent connects return False without touching the network, so a wedged printer is contacted twice an hour instead of hundreds of times a minute, and the single warning that is logged names the remedy. The cool-off is dropped on expiry rather than kept, so the map holds one key per currently wedged printer. ftps_handshake_blocked() lets the sweeps stop: the 3MF lookup abandons the remaining paths and skips the directory-walk fallback, the cover endpoint returns 503 naming the file service instead of a 404 that reads as "this print has no thumbnail", and the timelapse scan separates 503 (cannot reach the printer) from 404 (no timelapse directory) -- one 500 used to cover both, which is what the reporter hit when reproducing. The Connection Diagnostic completed a bare TCP connect to 990, which is why it reported the port green throughout: the port is open, it is what is behind it that is broken. It now completes a real implicit-TLS handshake using the model's own ftp_profiles cap, so a pass means the FTP client would also get through. An open port that cannot negotiate reports warn with reason no_tls, selecting a new message in all 13 locales that points at a printer restart rather than at the firewall. No login is attempted, so this stays valid in the pre-save Add Printer flow. The cool-off tests run against a real socket that accepts on 990 and replies with a plaintext FTP banner, reproducing WRONG_VERSION_NUMBER rather than mocking ssl. The autouse fixture clearing _mode_cache now clears the cool-off map too -- every test here talks to 127.0.0.1, so one left behind would make the next test's connect() a no-op. |
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