Bitbucket closes connection during pre-push hook

In our projects we have a number of tests and lints bound to pre-push hooks.

It seems that bitbucket server configuration was recently changed and now we get an error Connection to bitbucket.org closed by remote host. in the middle of our test execution. The whole test execution process takes around 3 minutes.

Due to this problem we have to push with --no-verify every time.

We are currently on paid plan of bitbucket. Please assist.