warn on connection failure

[HerrMuellerluedenscheid]

Hey,

This is a pull request and issue at the same time. I'm running the latest IRI version as follows:

java -jar iri-1.4.1.2.jar  -p 14265

on java

openjdk version "1.8.0_144"

Unfortunately, the chrome debugger reports the following when entering and submitting the seed:

localhost:14265/ Failed to load resource: net::ERR_CONNECTION_REFUSED
index.js:48 Account data undefined

At first I forgot to run the IRI and thought it would be nice to have a more self-explanatory error message like it's implemented in this PR:

However, the problem occurs also when IRI is running. The pyota examples fail as well with response: invalid API version. So, I guess I oversaw something obvious here.

[Twissi]

However, the problem occurs also when IRI is running. The pyota examples fail as well with response: invalid API version. So, I guess I oversaw something obvious here.

I was running into the same issue. Updating the iota lib worked for me: See pull request #4

[HerrMuellerluedenscheid]

Thanks. I tested using http://node.iotawallet.info instead of my localhost iri and it works fine with that one. I didn't setup my iri node, properly. I didn't look for any neighbors 😊
Wouldn't it make sense to add a field to switch from localhost to another node like the node.iotawallet.info. Is the leaderboard example actually still used? Is it worth the hassle to extend/improve that example?