same for me: "An Error Has Occurred! Session verification failed. Please try logging out and back in again, and then try again " when using dillo (but login works in Firefox).
dillo -v
Dillo v3.3.0-dirty
Libraries: fltk/1.3.11 jpeg/3.2.0 png/1.6.58 webp/1.6.0 zlib/1.3.1.zlib-ng brotli/1.2.0 OpenSSL/3.6.3
Features: +GIF +JPEG +PNG +SVG +WEBP +BROTLI +XEMBED +TLS +IPV6 +CTL
So, if it were not changes in the source (dillo), neither in the destination (the TC forum), then maybe is the middle man (the network)Nav_open_url: new url='https://forum.tinycorelinux.net/'
Dns_server [0]: forum.tinycorelinux.net is 217.160.150.65
Connecting to 217.160.150.65:443
forum.tinycorelinux.net: TLSv1.3, cipher TLS_AES_256_GCM_SHA384
0: sha256 2048-bit RSA: /CN=forum.tinycorelinux.net
1: sha256 2048-bit RSA: /C=US/O=Let's Encrypt/CN=YR1
2: sha256 4096-bit RSA: /C=US/O=ISRG/CN=Root YR
root: /C=US/O=Internet Security Research Group/CN=ISRG Root X1
NumPendingStyleSheets=1
NumPendingStyleSheets=2