After installing GDATA Antivirus Program, I cannot login into iCloud on Windows 10

Hi there chriss-KV,

We'd like to help get you signed in to iCloud on your Windows PC.

As there are several variables at this time, we'd like to narrow down the possible causes to this occurring:

1. You mentioned this occurred after installing the antivirus program you mentioned, but what occurs if you try signing in to iCloud for Windows after disabling the same antivirus program temporarily?
2. What occurs when you try signing in on the iCloud website itself?
3. Any updates for Windows, iCloud for Windows, or for the antivirus program?
4. Has a restart of your PC been tried?

Cheers!

Hello chriss-KV,

Regarding what you mentioned about changing your router settings, this is something we're not able to help with as we don't know what's been changed. If you feel that this is contributing to what's happening, we recommend reaching out to the router manufacturer for further help.

As it seems some of the details asked earlier went unanswered, along with more possible causes being introduced, we wanted to confirm the following with you to help determine the next steps:

1. What steps did you try when you contacted the antivirus support?
2. Was one of the steps deleting the entire antivirus program from your Windows PC, then test it afterwards?
3. We understood you already recently checked for the latest Windows updates, but we're not sure what you meant by 'not sure which all' regarding checking for updates for the other two things. Do you already have the latest update for the antivirus program? You'll need to speak again with the antivirus developer for how to check.
4. What about the latest version for iCloud for Windows? Just in case, here are the steps to Download iCloud for Windows.

Take care!