Chilkat v9.5.0.98 Release Notes

Previous Version: Chilkat v9.5.0.98 Release Notes General: Removed all internal usage of the R250 random number generation algorithm and replaced with the more cryptographically secure Fortuna algorithm. DNS: Fixed various DNS problems having to do with VPNs or other uncommon situations. Ftp2: Fixed situation where CreateRemoteDir is called, but the remote directory already exists. In this case, CreateRemoteDir will […]

Chilkat v9.5.0.97 Release Notes

Previous Version: Next Version: Chilkat v9.5.0.97 Release Notes SSH/SFTP/SshTunnel: Mitigated vulnerability to the Terrapin attack. See Chilkat v9.5.0.97 Mitigates Terrapin Attack Vulnerability CodeSign: Added the Chilkat.CodeSign class. This provides the ability (on Windows) to Authenticode sign DLLs and EXEs. It also provides the ability to validate Authenticode signed EXEs and DLLs, and to remove a signature. PDF: Added […]

Office365 SMTP AUTH XOAUTH2 Fails with “535 5.7.3 Authentication unsuccessful”

If you successfully minted an OAuth2 access token for your Azure Entra Id App, but then it fails when attempting to use it in the SMTP protocol for sending email with the error: AUTH XOAUTH2 user=xxx auth=Bearer ********************** 535 5.7.3 Authentication unsuccessful [ 2024-04-16T12:11:26.548Z 08DC9999186DF999] Check your Entra Id App Registration to make sure you have the following App Permissions:

How to Troubleshoot Office365 IMAP AUTHENTICATE XOAUTH2 Failed

Question: We have an issue reading mail and we see the below error message in log Login: DllDate: Oct 27 2023 ChilkatVersion: UnlockPrefix: *** UnlockStatus: 2 Architecture: Little Endian; 32-bit Language: *** VerboseLogging: 0 imapServer: loginX(2219ms): login: greeting: * OK The Microsoft Exchange IMAP4 service is ready. [***] authenticateXOAuth2(2219ms): xoauth2Imap(2219ms): ConnectionType: SSL/TLS ImapCmdSent: aaab AUTHENTICATE XOAUTH2 ImapCmdResp: […]

Capturing HTTP Cookies in a POST Response and Sending in Subsequent HTTP POST’s

Question: A particular REST/Web API returns a cookie. I need to capture this cookie and use it when sending subsequent POSTs. For example, this is the CURL statement to login and save the response cookie(s) to a file. curl -c cookies.txt -H “Content-Type: application/json” -X POST -d ‘{“username”:”user”,”password”:”pass”}’ Then I need to use the cookie when sending an SMS […]

Solving the CommonJS (Common JavaScript) and ECMAScript Modules (ESM) Problem

The following is a solution graciously provided by a Chilkat user trying to convert a node16 application using Common JS (require) to node20 using ESM (import). CommonJS (Common JavaScript) and ECMAScript Modules (ESM) are two different module systems used in JavaScript environments. CommonJS is the module system used in Node.js and is characterized by `require()` and `module.exports` syntax, while ECMAScript […]

GMail Mailboxes vs Labels

GMail technically doesn’t use mailboxes or folders. Instead it uses “labels”. Labels appear as folders (i.e. mailboxes) in email clients such as Outlook or Thunderbird, or as mailboxes in the IMAP protocol. See I recommend  comparing how your GMail looks in Outlook (or Thunderbird) vs the web browser at Notice how an email can be given multiple labels, […]

Chilkat v9.5.0.97 Mitigates Vulnerability to the SSH Terrapin Attack

Chilkat v9.5.0.97 makes changes to mitigate the Terrapin attack problem. It does so by modifying the selection of the default algorithms in the following ways: is no longer included by default. It can be re-added by specifying “” in the UncommonOptions property. We are going to keep the “-cbc” encryption modes because potentially too many servers would be affected […]