Electrum servers are currently under a DoS attack

[jackg]

By the way, it does connect (my one is set to auto) and allow to do transaction

It's still not functional for me. It says either stuck at synchronization or shows "Not connected" all the time even after changing servers.

On my laptop it just says "not connected". I can get it to work on my phone (at least my multisig is strong as I can't be bothered trying to test whether it works on my laptop anymore .

I'll load my phone up and send you a pm of the server that works if I can find it. I'll do the same for anyone who has earnt at least 100 merits (just in case).

Edit: my laptop says "not connected" because the server has anti ddos protection and my wifi can't support it (as the routing table is broken, I've finally worked out why it doesn't work)...

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[1714945013]

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[bitdaric]

By the way, it does connect (my one is set to auto) and allow to do transaction

It's still not functional for me. It says either stuck at synchronization or shows "Not connected" all the time even after changing servers.

On my laptop it just says "not connected". I can get it to work on my phone (at least my multisig is strong as I can't be bothered trying to test whether it works on my laptop anymore .

I'll load my phone up and send you a pm of the server that works if I can find it. I'll do the same for anyone who has earnt at least 100 merits (just in case).

Edit: my laptop says "not connected" because the server has anti ddos protection and my wifi can't support it (as the routing table is broken, I've finally worked out why it doesn't work)...

giveme 100 merits, so you could tell me that server

[HCP]

I confirm the same, I did not have any problems with sync - it take 5-10 seconds and I always have it on automatic. Is there any explanation why some users have big problems to connect to server and sync, while others do not have such problems? Except those who use versions older then 3.3.4, all users with latest version should have the same user experience. Is there something else what influence on sync problems, except fact that servers are under DoS attack?

Not necessarily. There are many factors at play other than just Electrum version. Things like:
- Number of transactions/addresses needed to sync
- Network speed/latency
- Local computer speed
- Server load

Even prior to the DoS attack, users who were attempting to sync wallets with thousands of addresses/transactions would also face really long sync times.

I previously didn't have any issues... but this morning seems relatively "bad"... Several servers which show up in the list will just result in "not connected" if I attempt to connect to them. I've managed to find one or two that seem to work OK at this time.

[BitMaxz]

I previously didn't have any issues... but this morning seems relatively "bad"... Several servers which show up in the list will just result in "not connected" if I attempt to connect to them. I've managed to find one or two that seem to work OK at this time.

I experienced this an hour ago but right now seems working fine to me and I noticed that more server is added to the server list.

Your Electrum might be blocked did you change your DNS recently?

[HCP]

No, it's not blocked... and DNS hasn't changed... just different servers are being DoS'd I guess... yesterday hsmiths and xskyx were fine... today, they won't connect. However, hodlister and jochen-hoenicke (which didn't work yesterday), are working OK.

That's the problem with this sort of thing... the goalposts are constantly moving... what works for me right now, probably isn't working for others (or me) in 2 hours

[pooya87]

some short time ago someone posted a new project about re-implementation of Electrum servers[1]. the project seems to be active and moderately popular on GitHub[2] so i am wondering whether anybody is actually running a server using that implementation in which case are they also affected by the DoS attack since the vulnerability is only in ElectrumX implementation in python[3]? if so then it can be a very easy solution to the current problem until they merge the PRs in ElectrumX and servers upgrade to new versions you could manually connect to those types of server.

[1] https://bitcointalk.org/index.php?topic=4589797.0
[2] https://github.com/romanz/electrs
[3] https://github.com/kyuupichan/electrumx

[mocacinno]

I had never heared about https://github.com/romanz/electrs, but after looking into it, it seemed like a nice service to setup since it didn't require me to enable txindex and reindex all blocks (i use my node as a lightning backend, so i don't want to stop it for an extended period of time).

I'm currently running electrs and it's building an index, i've setup nginx as reverse proxy and i've setup a manual ip whitelist in nginx so i can block every connection exept the manually whitelisted ones... So if the indexing is finished, and the server starts properly (i can't make any promises), i'll be able to offer a private electrum server in a couple of hours.

Do note the following restrictions apply:

• The server will only run for as long as there's a need for a private electrum server. As soon as the DDos'ing stops, the server goes down
• No guarantees for uptime or load whatsoever... I can take the service down at any moment i want without warning
• No other guarantees either.. Either use my service or don't, but if you do: do not complain!
• You'll need to trust me... You'll be connecting to my service directly AND you'll need to send me your public ip since i'll have to add it to the whitelist (don't post your ip in this thread... Use privnote or encrypt it using pgp and send it to me using a PM and ONLY after i've announced the server to be up and running)

I realise ip's can be spoofed, but this setup was the easyest one i could come up with...

[HCP]

I've personally used that "electrs" server... It seemed to run OK, even tho I was possibly "abusing" it a bit by running it in the Ubuntu "app" on Windows 10!!?! (the one that uses the "Windows subsystem for Linux").

Obviously, it requires a Bitcoin Core Full Node, but otherwise the requirements are relatively low. After the initial indexing time (took a few hours from memory)... it actually ran pretty well.

[stevegee58]

The Electrum server DDoS attack appears to be mitigated for the time being since the IP blacklist was released.