Network Management

SolarWinds Platform upgrade fails with 'Offline Environment' Error due to missing ISRG Root X1 certificate and R12 certificate

During a SolarWinds Platform upgrade, the online installer or Centralized Upgrade feature failed to connect to the internet and displayed an 'Offline environment' error, despite the server having valid internet connectivity.

First published date

10/7/2025 3:43 PM

Last published date

6/9/2026 9:53 PM

Overview

During a SolarWinds Platform upgrade using the online installer or Centralized Upgrade feature, the process fails with an error: 

Unable to connect to the internet. A connection could not be opened to https://downloads.solarwinds.com or you are in an offline environment. To perform upgrade, please download the installer from the Customer Portal.

Product section

Network Performance Monitor

Resolution

If you have followed the steps from SolarWinds upgrade fails with 'Offline Environment' Error due to missing DigiCert Root certificate, and the issue persists, perform the below on all SolarWinds servers:

To download the root certificate, you can download it directly from https://letsencrypt.org/certs/isrgrootx1.pem

  1. Click Windows Key + R and type in certlm.msc to open the local computer certificate store.
    1. From Trusted Root Certification Authorities> Certificates, import the ISRG Root X1 certificate.
    2. From Intermediate Certification Authorities> Certificates, import R12 certificate.
  2. Open SolarWinds Platform Service Manager > under the Dependencies section > restart SolarWinds Administration Service.
  3. Log in to the SolarWinds Platform web console, check the Deployment Health > UPDATES tab, and see if you can do a centralized update.