Cant access to web panel

Hi all

After upgrading Plesk from 12.5 to 12.5.30, we can not access the web panel. ¿how can i troubleshoot this issue?

I get this error:

504 Gateway Time-out

The service is listening...
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tcp 0 0 0.0.0.0:34033 0.0.0.0:* LISTEN 4075/sw-cp-server
tcp 0 0 0.0.0.0:34034 0.0.0.0:* LISTEN 4075/sw-cp-server
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I found this error in...

Cant access to web panel