It's worth noting that this issue has been occurring even when hg is having no issues with load on the server side. We observed that the server was quick to respond to requests from outside CI, but was failing to connect at all from inside CI. There may be some other issues with networking at play here.
Bug 1889955 Comment 2 Edit History
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It's worth noting that this issue has been occurring even when hg is having no issues with load on the server side. Yesterday evening we observed that the server was quick to respond to requests from outside CI, but was failing to connect at all from inside CI. There may be some other issues with networking at play here.