SDP service start but can't see login or other page (white page)

Hi,

We use SDP v9411 and suddenly we can't access to SDP panel. SDP service is start but I can't see any page of SDP even login page. I sent log file for you. I don't understand reason of this problem.

I see log file and see this error frequently:

No ManagedConnections available within configured blocking timeout ( 30000 [ms] ); - nested throwable: (javax.resource.ResourceException: No ManagedConnections available within configured blocking timeout

Also I search this error and see resolution, but I don't have any performance issue on our server and database and everythings is okay.

I don't know it's important or not. Please help me. What should I do?

Build No: 9411

DB: MS SQL

Thanks for helping