Blog posts

502 Bad Gateway with SVN copy, move or rename behind a reverse proxy

Problem: You have a SVN server sitting behind a reverse web proxy (e.g. for convenient SSL termination purposes). This works for new files, changes etc. but fails when you try to rename something, make a copy or move. The error is:

Unexpected HTTP status 502 'Bad Gateway'

The reason is explained here, but to summarise:

These operations involve sending a http COPY method. This includes a Destination: field in the header, which is not rewritten by Apache’s ProxyPass directives. Thus the destination field starts with https – not http. This confuses mod_dav on the SVN server.

Notes on getting Ubuntu 17.10 to work with NIS

See the guide for 16.04, but with the following caveats:

Looks like you still need to add nis explicitly to /etc/nsswitch.conf

The rpcbind service issue appears to be fixed.

FreeNAS kernel python3.6 was killed: out of swap space

Ran into an error with FreeNAS (version 11.1-RELEASE) where the system was complaining about running out of swap space (first noticed there was a problem when getting repeated emails about ‘Unauthorized system reboot’). The error on the console and in /var/log/messages is:

servername kernel: pid 26118 (python3.6), uid 0, was killed: out of swap space

Fortunately NFS was still working, and console login (using the second console) worked. Used this to enable ssh:

Creating mirrored swap devices on FreeNAS 11

As per the previous post, I was having problems with the swap partitions on my main FreeNAS 11 server. All the swap partitions were there, but were not being used until manually mounted. It turns out that FreeNAS now has a new way of using these – it seems to set up mirror devices using gmirror and uses these for swap. There are a couple of gotchas here – the first is that if you do a gmirror list on a working system you will see:

Setting proxy in Windows Server 2016 for the Update service

In Windows Server 2016 the usual trick of just setting a proxy server in IE doesn’t seem to work. The proxy can be set from the command line, but there is some contradictory advice out there. What worked for me was:

netsh winhttp set proxy proxy-server="your.proxy.server:port" bypass-list="*.your.local.domain"

This should result in:

Current WinHTTP proxy settings:
 
    Proxy Server(s) : your.proxy.server:port
    Bypass List : *.your.local.domain

You can also check this with

netsh winhttp show proxy

You are meant to be able to import this from IE, but that gave me a syntax error.