we have the following setup:
clients with windows7 and IE11 or Edge.
they have configured a squid proxy (3.5.20). squid is used for access to
intranet and internet. the squid it self talks to different central proxies
(internet, intranet) and they are talking to dmz proxies for internet access.
so Client -> (user) proxy -> (central) proxy internet -> dmz proxy -> internet
-> (central) proxy intranet -> intranet
we now see the folling problem:
when the clients are connected via wlan IE will hang on certain files and can't
load them. one of the files is a javascript file and so the page itself is not
loaded and waits and waits and waits. when you use the developer tools you can
see the contents of the javascript file but IE can't "finish" loading.
the same file via wired connection is working without any problems. with all
the caching on the different stations (client, proxy, central proxy) it is a
bit complicated to narrow the problem down. we have so far examined that the
size seems to matter. the javascript file with a size of 4039 bytes causes
troubles. we also saw this behavior with files the same size. if we add a few
lines and bytes to the that file it is working.
it seems not to make a difference whether if we talk about intranet or internet.
problem is, this error is a bit hard to reproduce. if IE is able to load the
file then (for a certain time) it is working every time. so we don't know what
happens if IE is not able to load the file.
the only thing that is clear at the moment is that a wired connection will work
and wlan will cause troubles.
is it a client side problem or a squid problem? sure there are differences if
connected via wlan or wire but which? and when how do they influence squid and
the connection?
any hints, ideas...
Mit freundlichen Grüßen
Markus Rietzler
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