Error 66 - Electrum doesn't send

[pfanner]

So far i tried changing the fee, checked/unchecked dynamic fees & change adresses and i tried mBtc/btc. I tried sending as much as 0.8something with no success. Any clues?

[torusJKL]

What version of Electrum are you using?
Do you want to send 0.8 btc or mbtc?
How many input addresses does your transaction have?

[GumtreeMan]

Hi
Sorry to join in on this thread but I am having a similar issue.

I am using Electrum 2.5.4 and until last week it was sending transactions without any issues.  The past few days however I keep getting an error screen also with the following message in part:
error: The transaction was rejected by the network rules.(66: insufficient priority)

I first took this to mean that the value of what I was trying to send was too low, but now I am still getting the same error with much larger amounts (BTC not mbtc). 

I used to have Dynamic fees selected which was only running at about 0.00015BTC/kb, but even turning that off and going to 0.0005BTC/kb as I have seen recommended in other places does not allow the transaction to go ahead

Thanks in advance to those that might be able to help out.

[dan91]

Try manually selecting a different server. I run electrumserv.noip.me and i know all priority's are default so it might be a good one to try? good luck!

Server admins can manually set min fees ext

[GumtreeMan]

Try manually selecting a different server.

Thanks Dan91, Manually setting the server seems to have done the trick for me, transactions are now flowing again

Cheers