Since today all MS Office files (Word, Excel) are open in the word Client application as Read Only mode, if I visit the SharePoint via https. If I Change the URL to http instead the Office files can be edit in word/Excel.

The HTTPS certificate is self signed but the certficated is added to the trusted certifcate store.

Any ideas why this happend? I think it is related to this Office security patch, because there is this Paragraph in the description: "This security update resolves a security feature bypass vulnerability that exists when Microsoft Office does not validate URLs"

  • can you check this certificate if is not expired? Mar 7, 2019 at 13:23
  • The certificate valid until 2028
    – Andy Ho
    Mar 7, 2019 at 13:38
  • so try uninstall this security patch on any laptop and try if its surely caused by this patch, if yes, we will dig more Mar 7, 2019 at 13:40
  • even if there are other updates from the feburar update - this one is not included. within the updates released on 5.3 i don't find any update that would point to my problem in its description.
    – Andy Ho
    Mar 7, 2019 at 15:09

1 Answer 1


i set up a lot of tests and noticed that the problem on my laptop was only related to my profile. so other users logon on my laptop and everything worked. so i finally removed my whole windows / AD profile from my computer - after that it works. i don't know why this problem has arisen and there are other users besides me where i have to use this procedure but at least it leads to success in the end

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