Cannot upload updated public keys - "Server indicated a failure"

[Hanns Holger Rutz]

hello,

disclaimer: gpg is a periphery piece of software in my life. please
don't assume that i'm going to unwind my computer because of this.

i sign emails and software with a gpg key. i had to extent its expiry
now. i cannot upload the updated keys:

$ gpg --send-keys 7437FCBA03E4CB85
gpg: sending key 7437FCBA03E4CB85 to hkp://keys.gnupg.net
gpg: keyserver send failed: Server indicated a failure
gpg: keyserver send failed: Server indicated a failure

i tried various other URLs known to me, same effect. i'm on debian
stretch with gpg 2.1.18. i cannot update my distribution at this moment.
i need to publish my updated key with reasonable effort.

enigmail also won't upload the keys.

thanks for you help!

best, .h.h.

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