--- title: Configuration if “Signature has a problem” is displayed (Mac OS) description: test --- [Skip to content](https://help.cloudsign.jp/en/articles/2668772#main-content) - [English](https://help.cloudsign.jp/en/articles/2668772) - [日本語](https://help.cloudsign.jp/ja/articles/2668772) English Show submenu for translations [![クラウドサイン ヘルプセンター](https://help.cloudsign.jp/hs-fs/hubfs/%E3%82%AF%E3%83%A9%E3%82%A6%E3%83%89%E3%82%B5%E3%82%A4%E3%83%B3_logo_horizontal_white_RGB@4x-1.png?width=170&height=40&name=%E3%82%AF%E3%83%A9%E3%82%A6%E3%83%89%E3%82%B5%E3%82%A4%E3%83%B3_logo_horizontal_white_RGB@4x-1.png)](https://help.cloudsign.jp/en/?hsLang=en) Open main navigation Close main navigation - - [English](https://help.cloudsign.jp/en/articles/2668772) - [日本語](https://help.cloudsign.jp/ja/articles/2668772) English Show submenu for translations How can we help you? - There are no suggestions because the search field is empty. 1. [CloudSign Help Center](https://help.cloudsign.jp/en?hsLang=en) 2. [Troubleshooting](https://help.cloudsign.jp/en/troubleshooting?hsLang=en) 3. [PDF / signature related](https://help.cloudsign.jp/en/troubleshooting?hsLang=en#pdf-signature-related) # Configuration if “Signature has a problem” is displayed (Mac OS) Use the following steps to resolve the “At least one signature is invalid.” message.   ### Contents - [Complete the initial configuration](https://help.cloudsign.jp/en/articles/2668772#N1) 1\. [Download the root certificate that is on your computer by default](https://help.cloudsign.jp/en/articles/2668772#N1-1) 2\. [Register the saved file in Acrobat Reader](https://help.cloudsign.jp/en/articles/2668772#N1-2) - [If the problem persists](https://help.cloudsign.jp/en/articles/2668772#N2)   ---   ### Complete the initial configuration #### **■ 1. Download the root certificate that is on your computer by default** 1-1. Go to \[ Finder \] → \[ Applications \] → \[ Utilities \] → \[ Keychain Access \]. 　 [![SignErrMac1](https://help.cloudsign.jp/hs-fs/hubfs/SignErrMac1.png?width=670&height=380&name=SignErrMac1.png)](https://help.cloudsign.jp/hubfs/SignErrMac1.png?hsLang=en)   1-2. From the Keychain Access \[System Roots\], find \[VeriSign Class 3 Public Primary Certification Authority - G5\], right-click to export and save the file. 　 [![SignErrMac2](https://help.cloudsign.jp/hs-fs/hubfs/SignErrMac2.png?width=670&height=374&name=SignErrMac2.png)](https://help.cloudsign.jp/hubfs/SignErrMac2.png?hsLang=en)   ---   #### **■ 2. Register the saved file in Acrobat Reader** 2-1. Open \[Acrobat Reader\] and click \[Preferences\]. [![SignErrMac3](https://help.cloudsign.jp/hs-fs/hubfs/SignErrMac3.png?width=479&height=267&name=SignErrMac3.png)](https://help.cloudsign.jp/hubfs/SignErrMac3.png?hsLang=en)   2-2. From the panel on the left side, select \[Signatures\] → \[Identities & Trusted Certificates\] then click \[More\]. [![SignErrMac4](https://help.cloudsign.jp/hs-fs/hubfs/SignErrMac4.png?width=670&height=454&name=SignErrMac4.png)](https://help.cloudsign.jp/hubfs/SignErrMac4.png?hsLang=en)   2-3. From \[Identities & Trusted Certificates\] click \[Import\] → \[Browse\], specify the file saved in step 1. and select \[Import\].　 [![SignErrMac5](https://help.cloudsign.jp/hs-fs/hubfs/SignErrMac5.png?width=670&height=439&name=SignErrMac5.png)](https://help.cloudsign.jp/hubfs/SignErrMac5.png?hsLang=en)   2-4. Click the \[Edit Trust\] button of \[VeriSign Class 3 Public Primary Certification Authority - G5\] to open the edit window. [![SignErrMac6](https://help.cloudsign.jp/hs-fs/hubfs/SignErrMac6.png?width=670&height=435&name=SignErrMac6.png)](https://help.cloudsign.jp/hubfs/SignErrMac6.png?hsLang=en)   2-5. Select \[Trust\] in the dialog box. Select the \[Use the certificate as a trusted root\] checkbox and click \[OK\]. [![SignErrMac7](https://help.cloudsign.jp/hs-fs/hubfs/SignErrMac7.png?width=549&height=646&name=SignErrMac7.png)](https://help.cloudsign.jp/hubfs/SignErrMac7.png?hsLang=en)   This completes the required settings. Close the file once, and then try opening the file again to check. ---   ### If the problem persists If the steps above do not solve the problem, try the following method. 1. Launch Acrobat or Adobe Reader. 2. From the \[Edit\] menu, click \[Preferences\]. 3. The \[Preferences\] dialog box is displayed. 4. a) From the panel on the left side, click \[Trust Manager\]. 5. b) Select the \[Load trusted certificates from an Adobe AATL server\] checkbox. 6. c) Click \[Update Now\]. 7. The \[Security settings have been successfully updated.\] dialog box is displayed. 8. Click \[OK\] to close the \[Security settings have been successfully updated.\] dialog box. 9. 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