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19c instant client and Docker

You should get there if you search for “ORA-12637: Packet receive failed” and “Docker”. Note that you can get the same error on old versions of VirtualBox and maybe other virtualized environments that do not correctly forward out-of-band data.

TL;DR: There are two workarounds for this:

  • get out-of-band correctly handled with a recent version of your hypervisor, or by disabling userland-proxy in Docker
  • disable out-of-band breaks usage by setting DISABLE_OOB=ON in sqlnet.ora (client and/or server)

But this post is also the occasion to explain a bit more about this.