ISA not allowing SSL connections.

[BoomAM]

Morning all,
This is just annoying me now, basically i need to allow all traffic to a specific set of sites through ISA for all users regardless of authentication status.
So like ive done a thousand times before:

From - Internal
To - URL Catagory
Traffic - All Outbound.
Who: All Users

Yet STILL ISA Blocks it! Any ideas?

Failed Connection Attempt ISA Firewall 18/01/2012 09:10:17
Log type: Web Proxy (Forward)
Status: 64 The specified network name is no longer available.
Rule: Filter - Website Traffic
Source: Internal (internal IP)
Destination: External (IPofWebsite:443)
Request: website.com:443
Filter information: Req ID: 085e8b32; Compression: client=No, server=No, compress rate=0% decompress rate=0%
Protocol: SSL-tunnel
User: anonymous
Additional information
Client agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; .NET CLR 2.0.50727; .NET CLR 3.0.04506.30; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729; .NET CLR 1.1.4322; InfoPath.3; MSOIDCRL 7.250.4287.0; MSOIDCRL-cfg 9.100.17198.0; App MSOIDSVC.EXE, 7.250.4287.0, {260
Object source: Internet (Source is the Internet. Object was added to the cache.)
Cache info: 0x0
Processing time: 0 ms
MIME type:

Any ideas?

Thanks.

 

[BoomAM]

2006 Enterprise.

Ive removed the rule in question to strip it back to the bare essentials of filtering, and its now being blocked by the default internet rule, but because its an SSL Tunnel for some reason.

Its frustrating as i need to get these open/working pronto as other internal 365 clients cant connect!