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Unable to start Steam

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Myuline Annatar Posted messages 8409 Status Membre -  
 Anonymous user -
Hello, following an update, I am restarting Steam at its request. But when it displays its little "Updating Steam" window, an error message pops up after about 1 minute: 
Steam must be in Online mode to perform the update. Check your network connection, and then try again.

That's the problem: I'm connected to the Internet, and I haven't used Offline mode for at least three months... (And I wasn't offline)...

I searched all afternoon for any solution, but all the ones that supposedly work every time changed nothing...

Thank you for your help.

PS: a small incomplete list of failed solutions:
Deletion of Steam files, repair, complete reinstallation, modification/deletion of registry keys, restarting the PC, checking the firewall (Bitdefender), ...
I've noticed that the Steam Client Service is stopped, in manual mode, and refuses to start manually.

Configuration: Manufacturer: Me! Yes, indeed! :)
Model: 1.3
Motherboard: Asus Z87-A
CPU: Intel Core i5 4670k (3.4 GHz)
GPU: MSI GeForce GTX 770 Twin Frozr OC GAMING, 2 GB
RAM: 16 GB DDR3 1600MHz
HDD: Seagate Barracuda, 1 TB
Case: Zalman Z9 U3
Headset-Microphone: Raptor LH2
Keyboard: I don't know what model from Emachines
Mouse: Raptor LM2
Screen: Acer G246HLBBID
OS 1: Windows 7 Home Premium SP1 64 bits
OS 2: Linux Mint Cinnamon 32 bits

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Myuline Annatar Posted messages 8409 Status Membre 1 188
 
I don't know why I didn't think of it before, but Steam started correctly by disabling the Bitdefender firewall.
But I still have the problem: the disabled firewall no longer protects me! What should I do for the rule I set to be taken into account?

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