I am getting this error
while opening from Report Manager URL
in SSRS.
Kindly help, I've got lot of reports there and I've to access those.
Basically you have to check if SSRS service is running or it is under high load.
You can try to restart it.( I think there was a SSRS bug when you changed the port it just stopped working. I think the restart will fix it)
If it dosent help check this out ->HERE