signalR client cannnot reconnect

Question

I have a website web.glidertracking.co.uk which seems to work well but after a short time it stops working.

In Firefox on the console I get the message

Firefox can't establish a connection to the server at ws://web.glidertracking.co.uk/signalr/reconnect?transport=webSockets&messageId=d-F12111CE-A%2C2F76%7CE%2C0%7CF%2C1%7CG%2C0&clientProtocol=1.4&connectionToken=9rtmojkUsiTz1k1hGHAHq5NDVy%2Fs96KyNyrvR1YDeHsqqraESwr4ky2waZfL4MRhFykwSxLEsdKMGQkKiH6Pkd7AZ%2BF1CqjuyN0xKcgxWb9PldJXF0ILOOw4JEE7A7wZ&connectionData=%5B%7B%22name%22%3A%22aprshub%22%7D%5D&tid=8. jquery.signalR-2.1.1.js:1622:36 This is repeated several times as the page tries to reconnect.

In Chrome the same thing happens with the message

WebSocket connection to 'ws://web.glidertracking.co.uk/signalr/reconnect?transport=webSockets&messageId=d-50D0B86A-A%2C42E5%7CH%2C0%7CI%2C1%7CJ%2C0&clientProtocol=1.4&connectionToken=088xfYgsm2yPs1Ig2VxFqLBuwlLoKtDPWl9FKEMr3%2Bt%2F%2F56DEnBqXBQiVoG93tfRPTxprdtPtKBGnKCAyDZfpy3Z1pw1pRiz6kxAGapXXoAhUDmeCQePBXVcdltFrfgh&connectionData=%5B%7B%22name%22%3A%22aprshub%22%7D%5D&tid=0' failed: Error during WebSocket handshake: Unexpected response code: 400

Can anyone Help me. What is going wrong?

I would be happy to provide the code for the whole site but there is a lot of code!

undejavue undejavue · Accepted Answer · 2017-04-18T09:59:48

Had similar issue, SignalR connection was ok, but re-connect fail with Unexpected response code: 404, or (after some manipulations with web.config) with Unexpected response code: 400.

Solved after checking & changing limitations for maxQueryStringLength, maxUrlLength, maxQueryString. in the Web.Config:

<system.web>
 <httpRuntime maxQueryStringLength="32768" maxUrlLength="65536"/>
 <security>
  <requestFiltering>
    <requestLimits maxQueryString="32768"/>
  </requestFiltering>
</security>
<system.web/>

Values "32768" & "65536" just for example, check and test your own.

P.S.In our case, we had a long query string, because we send all the hub's names to the server thinking that it is necessary for reconnect. But after all we saw, that it was no nessesary.

signalR client cannnot reconnect

1 Answers