Transient connection to peer error


When running to check if my IPFS node was publicly available, I was getting the multiaddr and downloading CID errors showing that my node wasn’t available.

I enabled port forwarding to 4001 as instructed in this article, but when I check again, I get now only There was an error downloading the CID from the peer: transient connection to peer (and of course, this causes a time-out error when querying the CID)

Any ideas how to solve this?

Thanks in advance for the help.

Are your nodes behind NAT ?

Yes, I am.

But I did port forwarding to 4001 using these instructions. Shouldn’t that have solved it?

There is a way to test,you could first make sure that your local node port 4001 can be accessed from a server from another public IP.

Just tested it out, from another machine, with nc YYY.YYY.Y.Y 4001 and got multistream/1.0.0 which basically means that the connection was established successfully.

This means that your node 4001 can be connected, but there is a possibility that node cannot connect to your node, so it connect the node through the relay. In my own experience debugging IPFS nodes, transient connection-to-peer errors occur in this situation.

Hello! I am stuck in this exact same issue too.

Is port-forwarding completely required? I was using this tool to verify.

When using /p2p/$peerID to look up my CID, it returned the transient error.

So far, I have not found a definitive answer. UPnP and PMT are enabled on my OpenWrt; but I could be overlooking something…

So I would like to know:

  • Is port-forwarding needed? I know UPnP is often used for network-local things - such as my SATIP server being recognized by VLC and TVHeadend - but can it also be used for port-forwarding? I have never heared about PMT, but it is enabled.
  • Can I use hole-punching to work around this if I don’t want to neccessarily open up a port? I could; I would just like to know if I really must :wink: Knowing more is always a lil’ better.
  • As a little off-topic, but assuming the tool can find my content now using the P2P address, how can I then instruct an IPFS gateway - say - to connect to my maschine through p2p so my friend can access the file i am sharing for him?

Thanks a bunch! :slight_smile:

Hi, I am behind a NAT (home router connected to another router, which is connected to the internet). I see the same error, if I do not announce my public IP explicitly via the IPFS node configuration having port forwarding enabled. It seems that whenever my node is establishing a connection via a relay node (which it seems to do automatically, if I don’t announce my public IP), it can fetch files from the IPFS network, but it cannot provide files to the network. Furthermore, according to ipfs swarm peers --direction all my connections are outbound.

Is it correct, that the “transient connection” is indicating a connection that is working over a relay? If so, why does that prevent my IPFS node from providing files even though I can connect to other nodes?

I am experiencing the same issue (I confirmed that my UPnP is working with a quick nc), did you find a way to fix it ?

It indeed seams like this is indeed a issue with relays:

❌ Could not connect to multiaddr: failed to dial 12D3KooWJHRXk8USQCwuP8ixQaGgWGiUQ8yBjakesYz1WuVskaRo:
  * [/ip4/] error opening relay circuit: NO_RESERVATION (204)
  * [/ip4/] concurrent active dial through the same relay failed with a protocol error

I have no issues getting the file from another machine in a datacenter away from me, but neither IPFS check nor public gateways can get the file, seemingly because they try to go through a relay…

I seem to be having the same issue.

Running ncat remotely shows the port as open by returning /multistream/1.0.0, although ipfs swarm peers --direction shows all connections as outbound, and I keep getting:
❌ There was an error downloading the CID from the peer: transient connection to peer on the IPFS checker pages.