There are many possible causes for this error. However, since it happens only periodically for you, my first guess would be that it's a network error. Run some tests on your communications port (by default 4747) to see how lossy it is. Also check any firewall policies (both software and hardware).
It seems that you've configured ISA to forward /script/qvstunnel.dll to your IIS instance. This might seem desirable only because the QvWS doesn't provide a human-readable response to /scripts/qvstunnle.dll?test but it DOES still process those requests from the client.
I suggest you configure ISA to forward /scripts to QvWS, stop IIS (or remove the /scripts virtual directory), and create a port-forwarding rule on ISA so that incoming tcp/4747 requests are delivered directly to the QlikView Server.
Also your IIS and QvWS can share port 80 and/or port 443 if you start the Windows "Net TCP Port Sharing service".
- "I suggest you configure ISA to forward /scripts to QvWS, stop IIS (or remove the /scripts virtual directory)"
I do this, and have another error:
- "and create a port-forwarding rule on ISA so that incoming tcp/4747 requests are delivered directly to the QlikView Server."
We can't do that, because our client security settings don't allow non-standart outgoing ports...
On ISA I see:
Failed Connection Attempt TMG 22.01.2010 11:27:31 Log type: Web Proxy (Reverse) Status: 64 The specified network name is no longer available. Rule: QLIKVIEW WEB (SSL) Source: External (***.***.***.***:40560) Destination: Local Host (qv2008.mdm.local 10.1.2.7:443) Request: POST https://10.1.2.7:443/scripts/QVSTunnel.dll?host=qv2008 Filter information: Req ID: 0a0c8bd5; Compression: client=No, server=No, compress rate=0% decompress rate=0% ; FBA cookie: exists=no, valid=no, updated=no, logged off=no, client type=unknown, user activity=yes Protocol: https User: anonymous
- Additional information
- Client agent: QlikView Client
- Object source: Internet (Source is the Internet. Object was added to the cache.)
- Cache info: 0x0
- Processing time: 1 MIME type: