Outlook signature issue (hosted Images)

Fabzster · May 30, 2018, 11:18 AM

I am having an issue since monday, We have a Hosted exchange server and we use outlook clients to connect to it, we have html signatures with links to images on a public available web server.

Since monday if a user clicks new email it hangs and the whole machine freezes, If I remove the signature the problem disappears, If I bypass the proxy (Transparent + Squidguard) then I also do not have the issue.

From behind the proxy I can browse directly to the hosted images, it is only via outlook that this is occuring, I also updated from to 2.4.3-RELEASE-p1 recently.

I had a suspicion that this was a caching issue so set the HDD cache to 0 and cleared it, I additionally deleted the cache directory (user/var/squid/cache).

In the squid access table I see now that I get the following :

TCP_INM_HIT/304 for all signature files, I cannot find INM in the squid cache documentation, what does it mean?

2.4.3-RELEASE-p1
squid 0.4.43_1
squidGuard 1.16.4

Any assistance is greatly appreciated

Fabzster · May 30, 2018, 12:57 PM

to add to the above:

I moved the cache directory back to the default /var/squid/cache then set:

Hard Disk Cache Size = 0
Hard Disk Cache System = null

restarted squid and now I am getting TCP_MISS/304 for the signature pics, should I not be getting 200 code ?

I can still browse directly to the signature files via browser but get the following in Outlook:

Fabzster · May 30, 2018, 1:16 PM

I cant seem to edit my original post, thats the reason for the replies, I hope this is not an issue

Update: I have started getting the following as well for signature images:
TAG_NONE_ABORTED/000 - -
TCP_INM_HIT/304

lburr · May 30, 2018, 2:28 PM

Have you restarted the router since you deleted the cache directory? When did you update to 2.4.3-RELEASE-p1? Or was it still working after you updated?

Fabzster · May 30, 2018, 3:05 PM

Hi

Many thanks for the reply,

I upgraded it from 2.4.3 to 2.4.3-p1.

I restarted the pfsense box and the router again to eliminate that and noticed a couple of new status's in the Squid access table with regards to the signature files.

TCP_REFRESH_UNMODIFIED/200
TAG_NONE_ABORTED/000

The images are still not being displayed in outlook. :(

lburr · May 30, 2018, 3:24 PM

I think the NONE_ABORTED is because it can't retrieve the images from the cache.

Can you set the hard disk cache size back to what it was previously?