Anyconnect triggers Hosts File Access warning on Avira

The company I work for uses Anyconnect to provide VPN services.
I'm wondering why Anyconnect 3.0.10055 triggers a Hosts File Access warning on Avira Anti-Virus on my Windows 7 64Bit PC? I tried turning the Avira protection off and then connecting and detected no changes to the file. Anyconnect connects fine even when Avira blocks access. Is Anyconnect opening it for write, but not writing?
On a separate note, why does Anyconnect use 6 ip addresses? What document should I read?
Thanks,
Bruce

Hi Bruce
as far as I understood, AC indeed modified the hosts file but just for a very short time during connection establishment.
To be more precise, after doing a DNS lookup of the head-end (ASA or router) it will rename the hosts file and create a new one that contains the result of the DNS lookup. This is to make sure that subsequent name lookups return the same ip address. When the connection is established, the original hosts file is restored.
Now, this is only important in scenarios where DNS load balancing is used, so where the DNS name you connect to potentially resolves to 2 or more different ip addresses. This could cause a problem if at different stages of the connection process we use different ip addresses, hence we store the first ip address in the hosts file.
So if you don't use VPN load balancing then you should not see any problem if the hosts file cannot be modified.
What 6 addresses are you referring to?
hth
Herbert

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# Updated sorted and maintained by Andrew Short (sh0rtie)
# Contact: [email protected]
# A big thank you to all contributers (too many to mention)
# who really have made this project a success, well done :)
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# http://www.gnu.org/licenses/lgpl.txt
# WARNING:
# This file is *extremely comprehensive* and some sites might be
# included here that you wish to visit, if this is the case you can
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127.0.0.1 pop3.spa.norton.antivirus
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127.0.0.1 klickcash.com
127.0.0.1 loomia.cachefly.net
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127.0.0.1 privacy.virtumundo.com
127.0.0.1 redirect.virtumundo.com
127.0.0.1 tds.megatds.com
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127.0.0.1 the2all.info
127.0.0.1 treeloot.com
127.0.0.1 ultraload.net
127.0.0.1 ultratds.com
127.0.0.1 v1.cc
127.0.0.1 virtumundo.com
# etc...
The thing i'm unsure of is this section:
# You must keep the below lines
127.0.0.1 localhost
Since localhost is already stated here:
#<ip-address> <hostname.domain.org> <hostname>
127.0.0.1 localhost.localdomain localhost pote
For now I've deleted the redundant localhost entry, since it seems to be there for windows compatability.
Is there any harm in leaving that entry?
Last edited by verve (2008-11-29 04:08:29)

Not as far as I know.
It probably just re-encounters the localhost hostname and either dumbly re-adds it to the internal table or ignores it. In any case, no logically discernible harm done.
-dav7

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