[GH-ISSUE #207] Problem with Proxy-Server (Deny Authentication in NTLM) #670

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opened 2026-03-01 17:40:48 +03:00 by kerem · 3 comments

kerem commented

2026-03-01 17:40:48 +03:00

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Originally created by @neupertd on GitHub (Aug 22, 2017).
Original GitHub issue: https://github.com/aluxnimm/outlookcaldavsynchronizer/issues/207

Hello We use a Proxy-Server with transparent NTLM-Authentication (Sophos).
Since last Update, CalDavSynchronizer kills the Authentication and the User will be blocked at Win-Domain.
The normal Proxy-Settings inside CalDavSynchronizer works as well before.

Profile --> Network Settings --> Use preemtive authenticaten = yes and at Proxy Setting use system Default = yes

CalDSavSynchronise 2.23.0.0
Windows 7 Prof
Ouitlook 2010
log.txt

Originally created by @neupertd on GitHub (Aug 22, 2017). Original GitHub issue: https://github.com/aluxnimm/outlookcaldavsynchronizer/issues/207 Hello We use a Proxy-Server with transparent NTLM-Authentication (Sophos). Since last Update, CalDavSynchronizer kills the Authentication and the User will be blocked at Win-Domain. The normal Proxy-Settings inside CalDavSynchronizer works as well before. Profile --> Network Settings --> Use preemtive authenticaten = yes and at Proxy Setting use system Default = yes CalDSavSynchronise 2.23.0.0 Windows 7 Prof Ouitlook 2010 [log.txt](https://github.com/aluxnimm/outlookcaldavsynchronizer/files/1241876/log.txt)

kerem closed this issue

2026-03-01 17:40:49 +03:00

kerem commented

2026-03-01 17:40:49 +03:00

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@aluxnimm commented on GitHub (Sep 12, 2017):

What do you mean by "the normal proxy settings work as well before" ?
The versions before 2.23.0 did work with your proxy and the google profile?

@aluxnimm commented on GitHub (Sep 12, 2017): What do you mean by "the normal proxy settings work as well before" ? The versions before 2.23.0 did work with your proxy and the google profile?

kerem commented

2026-03-01 17:40:49 +03:00

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@neupertd commented on GitHub (Sep 12, 2017):

Yes it worked before, but i do a downgrade and it dont want work to.
I will talk to my Firewall-Admin to check this. I will tell you more soon.

Best regards
Dirk Neupert

Ja, es lief bisher. Allerdings läuft es trotz eines Downgrades auf die
vorherige Version immer noch nicht. Ich werde das noch einmal mit meinem
Firewall-Admin klären und melde mich dann wieder falls ich eine Info habe.
Zur Info unserem Proxy-Servers. Es handelt sich dabei um ein Sophos-System,
dass per NTLM über die jeweilige Domänenkennung den Zugang in das Netz
freigibt. Die Authentifzierung erfolgt dabei transparent ohne Eingriff des
Nutzers.

Viele Grüße
Dirk Neupert

2017-09-12 21:04 GMT+02:00 Alex Nimmervoll notifications@github.com:

What do you mean by "the normal proxy settings work as well before" ?
The versions before 2.23.0 did work with your proxy and the google profile?

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You are receiving this because you authored the thread.
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https://github.com/aluxnimm/outlookcaldavsynchronizer/issues/207#issuecomment-328950414,
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@neupertd commented on GitHub (Sep 12, 2017): Yes it worked before, but i do a downgrade and it dont want work to. I will talk to my Firewall-Admin to check this. I will tell you more soon. Best regards Dirk Neupert Ja, es lief bisher. Allerdings läuft es trotz eines Downgrades auf die vorherige Version immer noch nicht. Ich werde das noch einmal mit meinem Firewall-Admin klären und melde mich dann wieder falls ich eine Info habe. Zur Info unserem Proxy-Servers. Es handelt sich dabei um ein Sophos-System, dass per NTLM über die jeweilige Domänenkennung den Zugang in das Netz freigibt. Die Authentifzierung erfolgt dabei transparent ohne Eingriff des Nutzers. Viele Grüße Dirk Neupert 2017-09-12 21:04 GMT+02:00 Alex Nimmervoll <notifications@github.com>: > What do you mean by "the normal proxy settings work as well before" ? > The versions before 2.23.0 did work with your proxy and the google profile? > > — > You are receiving this because you authored the thread. > Reply to this email directly, view it on GitHub > <https://github.com/aluxnimm/outlookcaldavsynchronizer/issues/207#issuecomment-328950414>, > or mute the thread > <https://github.com/notifications/unsubscribe-auth/ASkSzL11tG_CLQqcLzn9SdMp5HiaNxE8ks5shtW7gaJpZM4O-dOL> > . >

kerem commented

2026-03-01 17:40:49 +03:00

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@neupertd commented on GitHub (Sep 20, 2017):

Works fine with new Release 2.24.0

@neupertd commented on GitHub (Sep 20, 2017): Works fine with new Release 2.24.0