IMAP Connection works only sporadically 365

[GGSMK]

I set up the proxy, smtp works without problem, when when trying to receive mails, most of the time i only get server disconnected and client disconnected.

2023-10-12 10:24:13: New incoming connection to IMAP server at ipv4:1993 (unsecured) proxying outlook.office365.com:993 (SSL/TLS) 2023-10-12 10:24:13: Accepting new connection to IMAP server at ipv4:1993 (unsecured) proxying outlook.office365.com:993 (SSL/TLS) via ('ipv4', 53767) 2023-10-12 10:24:34: IMAP (ipv4; ipv4:53767->outlook.office365.com:993) <-- [ Server disconnected ] 2023-10-12 10:24:34: IMAP (ipv4:1993; ipv4:53767->outlook.office365.com:993) --> [ Client disconnected ]

has anyone ever encountered something like this?

my config:

[IMAP-1993] server_address = outlook.office365.com server_port = 993 local_address = 172.21.99.88

[mailauth@iltis.de] permission_url = https://login.microsoftonline.com/xxx/oauth2/v2.0/authorize token_url = https://login.microsoftonline.com/xxx/oauth2/v2.0/token oauth2_scope = https://outlook.office365.com/IMAP.AccessAsUser.All https://outlook.office365.com/POP.AccessAsUser.All https://outlook.office365.com/SMTP.Send offline_access redirect_uri = http://localhost client_id = xxx client_secret = xxx last_activity = 1697097851 token_salt = xxx access_token = xxx access_token_expiry = xxx refresh_token = xxx

[emailproxy] delete_account_token_on_password_error = True encrypt_client_secret_on_first_use = False

[simonrob]

What happens if you try to connect directly to the O365 server via telnet? (i.e. without the proxy)

Do you have the same issue with:

• A different O365 account
• A different email client
• A different OAuth 2.0 client ID/secret
• A different email server (e.g.; Gmail)

[GGSMK]

i cant connect to the o365 server via telnet,. I used the proxy with same settings in another network with no issues, maybe something is getting blocked in the original network, i´ll investigate.

[simonrob]

I should have been clearer: you'll need to use, e.g.; openssl s_client -crlf -connect localhost:1993 to connect to an encrypted remote server such as O365. But if this doesn't work then the error you get might help debug the proxy issue you're facing.

[simonrob]

Were you able to resolve this?

[GGSMK]

Yes i was. Firewall blocked connections to the imap server.