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Home > Success Center > Network Configuration Manager (NCM) > NCM - Knowledgebase Articles > Unable to Download Configs after updating to Fortinet version 5.2.5

Unable to Download Configs after updating to Fortinet version 5.2.5

Updated April 28th, 2016


After upgrading your Fortinet OS to version 5.2.5, you are not able to download configs even without changing anything on your NCM configuration. When you perform a test under edit nodes, the following error appears:


Connection Refused by x.x.x.x


NCM 7.0 and later


This is a known issue (BUG ID: 300588) with FortiNet OS (FortiOS) version 5.2.5. Refer to below Thwack post:

Cipher Protocols Supported by NCM SSH


Currently NCM supports key sizes of 1024 bits since it is using diffie-hellman-group-exchange-sha1 and diffie-hellman-group1-sha1. FortiGate requires SHA2 encryption (2048 bit key) and is dropping SHA1 connections.


Perform either of the following:

  • Use TELNET to connect on your Fortinet device with FortiOS version 5.2.5.
  • Downgrade your Fortinet OS so you can still use SSH.
  • If on NCM 7.4.1, install Hotfix 3.
  • If on NCM 7.5.0, install Hotfix 1.


Note: Per Fortinet, this issue is expected to be resolved in future version of the FortiOS. However, on version 5.2.6, the issue is still not resolved or mentioned on this 5.2.6 release notes: FortiOS Release Notes Version 5.2.6 (© 2017 Fortinet, available at, obtained on March 29.2017.)


According to Thwack post FortiNet should have the issue resolved in version 5.2.7 or 5.4.1 of FortiOS.


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