Could not connect to WebDAV server in iPadOS 18.7.3

cyyin
debug ID: D2062311706

I chose jianguoyun as WebDAV server and used Zotero smoothly with it in iPadOS 16.6 version. However, today I update my iPad to 18.7.3 version and I can’t use jianguoyun to sync any more. It always says “Could not connect to WebDAV server”. It still works on my desktop and phone, only failed on my iPad.
  • cyyin
    I also used Zotero today just after I updated my iPadOS version from 16.6 to 18.7.3. Although 1 issue that told me some file in WebDAV servers failed to sync, I can still use Zotero on my iPad. But after I deleted and redownloaded it, now I cannot even use Zotero since all my files are stored in jianguoyun and Zotero fails to connect to it.
  • dstillman Zotero Team
    (+0000161): HTTP OPTIONS https://dav.jianguoyun.com/dav/zotero/ failed with -1
    [ERROR] Zotero(+0000006): sessionTaskFailed(error: Error Domain=NSURLErrorDomain Code=-1200 "An SSL error has occurred and a secure connection to the server cannot be made." UserInfo={NSLocalizedRecoverySuggestion=Would you like to connect to the server anyway?, _kCFStreamErrorDomainKey=3, NSErrorPeerCertificateChainKey=(
    "<cert(0x11eb24a00) s: *.jianguoyun.com i: Sectigo Public Server Authentication CA DV R36>",
    "<cert(0x12cf2d400) s: Sectigo Public Server Authentication CA DV R36 i: Sectigo Public Server Authentication Root R46>",
    "<cert(0x1181c4a00) s: Sectigo Public Server Authentication Root R46 i: USERTrust RSA Certification Authority>"
    This would be some problem with certificates on your device. It's a valid certificate. I'm able to connect to it on 26.3.1.
  • cyyin
    edited 14 days ago
    Yeah, it seems a security update issue cracked some SSL certificates on my iPad. Today I updated my iPad to iPadOS 26.3.1, and I can now use Jianguoyun as my WebDAV server without errors.
    Thanks for the guidance.
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