# net::ERR\_CERT\_DATE\_INVALID on auth pdfjs.express **URL:** \ **Category:** Bug Reports\ **Tags:** pdfjs-express\ **Created:** [August 31, 2020, 11:57am UTC](https://pdfjs.community/t/net-err-cert-date-invalid-on-auth-pdfjs-express/233 "2020-08-31T11:57:14Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![ipquants](https://avatars.discourse-cdn.com/v4/letter/i/2bfe46/32.png) [@ipquants](https://pdfjs.community/u/ipquants)\ **Post date:** [August 31, 2020, 11:57am UTC](https://pdfjs.community/t/net-err-cert-date-invalid-on-auth-pdfjs-express/233/1 "2020-08-31T11:57:14Z")
**Detailed description of issue** The auth call gets a net::ERR\_CERT\_DATE\_INVALID error and as a result the watermark is added on the viewer. When the call is made from the browser, [https://auth.pdfjs.express/?key=](https://auth.pdfjs.express/?key=)… one can see that the certificate has expired. ![image](https://canada1.discourse-cdn.com/flex031/uploads/pdfjscommunity/original/1X/d3fa6c2063b3da3626f81a100617e328fd003a34.png) ---
**Author:** ![Logan](https://yyz1.discourse-cdn.com/flex031/user_avatar/pdfjs.community/logan/32/13_2.png) [@Logan](https://pdfjs.community/u/Logan)\ **Post date:** [August 31, 2020, 2:10pm UTC](https://pdfjs.community/t/net-err-cert-date-invalid-on-auth-pdfjs-express/233/2 "2020-08-31T14:10:18Z")
Thank you! We will fix this ASAP. ---
**Author:** ![ayushi.thakkar](https://avatars.discourse-cdn.com/v4/letter/a/3ec8ea/32.png) [@ayushi.thakkar](https://pdfjs.community/u/ayushi.thakkar)\ **Post date:** [March 11, 2025, 5:40am UTC](https://pdfjs.community/t/net-err-cert-date-invalid-on-auth-pdfjs-express/233/3 "2025-03-11T05:40:26Z")
To solve the error ERR\_CERT\_DATE\_Invalid on auth [pdfjs.express](http://pdfjs.express), I found the following helpful resource at [https://certera.com/kb/how-to-fix-the-neterr-cert-date-invalid-error/](https://certera.com/kb/how-to-fix-the-neterr-cert-date-invalid-error/), and it worked well. Check it out once.