CheckMK upgrade 2.1.0p15 -> 2.3.0p27 - Failed to parse graph update response: ERROR: None

Troubleshooting
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Unclear as you have not given any detail as to the way (path) you followed upgrading from 2.1.0p15 → 2.3.0p27

Did you follow the recommended intermediate upgrades as discussed in this post ?

  • Glowsome