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Hi, when I run R CMD check with flag --as-cran, the process hangs at stage: * checking CRAN incoming feasibility ... I am pretty sure it is a proxy issue. I looked at the check code in the tools package and it seems that the issue is in the local function `.repository_db()` (defined in `tools:::.check_package_CRAN_incoming()`), which eventually calls `url()` with argument open="rb", that hangs probably because it does not use the proxy settings. I had a similar issue with `source()`, which apparently uses internal network functions (not as download.fi...