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TFTP Server failed to start – solved

Symptoms

Running an upgrade from NPM and NCM 2019.4 to 2020.2.1 with offline installer.

We failed on the TFTP server install and saw that the server after a long timeout just didn’t want to start. Tried to extend the “service pipe timeout” according to https://thwack.solarwinds.com/t5/TFTP-Server-Discussions/TFTP-Server-software-install-problem/m-p/26... but that didn’t help.

Diagnosis

With a little help from Process monitor: https://docs.microsoft.com/en-us/sysinternals/downloads/procmon  , we found that the service was trying to access “…akamaitechnologies.com” on some IP-addresses. Probably to verify CRL’s or signatures on some code. As the environment don’t have access to Internet we figured it did not get a block from the firewall but rather a drop – giving a long timeout.

Solution

So we created our own block in windows firewall.

  • Just open Windows Defender Firewall with Advanced Security
  • Create a new outbound custom rule
  • Block everything towards at least 93.184.220.29 and 93.184.221.240 (we blocked 93.184.0.0/16 as we can’t access it anyway)

Rerun the installation and all should be fine!

Version history
Revision #:
1 of 1
Last update:
a week ago
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