I'm afraid that a dump of your httpd.conf file was WAY too long for me to read online.
But what followed it was interesting. I'm not sure offhand if nsapi is part of Apache or not. But it appears that that particular component may be having problems talking back to the client. Either that or you have some sort of downstream server that's supposed to be listening on its port #3263 and is having problems of its own.
Customer surveys are for companies who didn't pay proper attention to begin with.