With the new "Advanced" UrlFormat option in DNN 7.1 you might run into problems if you want to use SignalR with your modules. This tutorial explains how you can "override" the URL settings in DNN 7.1 to add additional options. In the DNN Platform, you have to do this manually, via the database, I believe the EVOQ ($paid$) versions have a UI for this, but for those of us who focus specifically on the open source platform, you need to make manually update database entries to customize the URL handling in 7.1+.
In order to get SignalR working in 7.1, you'll want to add a HostSetting (or portal setting if you wish, but I won't provide the SQL for that) that defines the AUM_DoNotRewriteRegEx setting. Here is a sample SQL script that will do that. (as always, run at your own risk, backup before executing, I'm not responsible for you screwing up your website).