Questions tagged [firewalls]

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48
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1answer
50k views

Which TCP and UDP ports are required to run an Ethereum client?

The geth CLI options suggest that per default the client listens on TCP port 30303. This page, additionally suggests that UDP port 30301 is used for node discovery. Is this all that is required or ...
11
votes
4answers
486 views

How to determine if ISP is blocking Ethereum traffic

My "Ethereum Wallet" from ethereum.org used to connect to several peers. A while ago I noticed it was taking longer and longer to sync and the number of peers dropped. It got worse, and seldom ...