• I performed some update maintenance on my sites today and encountered a problem with the dashboard update process that I have not seen before. Core updates, plugin updates and theme updates all complete normally regardless of where they are initiated from. However, when updates are initiated from the dashboard update screen, the following information is displayed on the screen the then the process hangs and no further information is displayed.

    Purged all caches successfully.
    
    The update process is starting. This process may take a while on some hosts, so please be patient.
    
    Enabling Maintenance mode…
    
    Updating Plugin (name) (1/1)

    Updating a single item from the dashboard update screen always completed, although without the complete notifications being shown. I was able to complete all of the updates on all my sites one at a time. However, when I tried updating 6 or 7 plugins at one time, only one plugin was actually updated, and the update process hung leaving the site in maintenance mode. I had to delete the .maintenance file with FTP to get back into the site back end.

    A google search and a search on this support forum did not return anyone posting a similar issue, so I assume that this is not due to code in the core. I did find a post from several years ago where someone had a similar problem and determined it to be a problem with WordPress interacting with the host server, where the problem was not replicated on other servers.

    My host, Webhost Python, uses Lightspeed servers, and upgraded the server where my sites reside this past weekend, described as: “migration of NS62 to new servers, new NVMe SSD drives and newer hardware.” I have a support ticket open with Webhost Python about this issue suggesting that it may be because of the server upgrade. But I don’t have a definitive answer from them yet.

    Could my assumption that this is likely an issue with the interaction of WordPress and the server be wrong? Is this a known issue, or something that would have another cause? Any help knowledge would be appreciated.

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  • Thread Starter Michael1950

    (@michael1950)

    It turns out the issue *was* with the server. I received the following message from the host’s technical support:

    “It appears that the issue is due to zlib output compression being enabled. As a result, the output is being flushed before it can be seen.

    I’ve changed this setting, and you should now see all the update messages.”

    My testing confirms that this solved the issue.

    • This reply was modified 7 years, 4 months ago by Michael1950.

    Thanks so much @michael1950 for posting this solution – Several sites, all updates completed fine but no message ever arrived. Bugged me for weeks. But zlid.output_compression was the answer 🙂

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